Maldek · Clinical Reasoning
The Condition Catalog
Organised the way clinicians think: body system first, then the condition. Adult and pediatric are kept apart because they behave apart. In the Nursing Student view, open a condition for prioritization, mechanism, and bedside safety.
Clinical Reasoning
Acute Coronary Syndrome
A clot blocks a heart artery, and heart muscle starts dying because it cannot get oxygen.
Clinical Reasoning
Acute Decompensated Heart Failure and Pulmonary Edema
The heart cannot pump blood forward, so blood backs up into the lungs and fluid floods the air sacs where you breathe.
Clinical Reasoning
Aortic Dissection
A tear in the innermost layer of the aorta (the smooth lining) allows blood to split the wall into two channels—one true, one false—and that false channel can block the arteries feeding your brain, heart, kidneys, intestines, and legs.
Clinical Reasoning
Aortic Regurgitation
The aortic valve fails to close all the way when the heart relaxes, so blood that was just pumped out leaks backward into the main pumping chamber with every heartbeat.
Cardiology
Aortic Stenosis
The aortic valve has narrowed, forcing the left ventricle to generate dangerously high pressure to push blood through.
Clinical Reasoning
Atrial Fibrillation or Flutter with RVR
The top chambers of the heart (atria) either quiver like a bag of worms (atrial fibrillation) or spin in a very fast circle (atrial flutter), so they cannot squeeze blood down into the bottom chambers anymore.
Clinical Reasoning
AV block
The electrical signal from the top chambers gets delayed or blocked before it reaches the bottom chambers.
Cardiology / Emergency
Bradycardia
A heart rate below 60 beats per minute is called a slow heart rate (bradycardia). It becomes an emergency when the slow rate causes symptoms — dizziness, fainting, chest pain, or confusion — because those symptoms mean the body is not getting enough blood. An electrocardiogram (ECG; a tracing of the heart's electrical signals) shows whether the slow rate is coming from the heart's natural pacemaker, from a traffic jam in the heart's wiring, or from a complete electrical block.
Clinical Reasoning
Bradycardia Algorithm
Heart rate below 60 beats per minute with signs that the body is not getting enough blood—like low blood pressure, confusion, chest pain, or pale sweaty skin.
Critical care
Cardiac Arrest Rhythms
When the heart stops, it shows up in one of four rhythms on the monitor—two you can shock, two you cannot.
Cardiology Emergency
Cardiac Tamponade
Fluid fills the sac around the heart and squeezes it so hard the heart cannot fill with blood.
Cardiology
Cardiogenic Shock
The heart muscle is so badly damaged that it cannot pump enough blood forward to keep the body's organs alive.
Clinical Reasoning
Cardiomyopathy
Cardiomyopathy means the heart muscle is sick—it might squeeze too weakly, get too thick, turn stiff, or fill with scar—and each type breaks the pump in a different way.
Clinical Reasoning
Chest Pain and ACS Triage
Chest pain triage means finding the life-threatening causes first: STEMI (complete blockage heart attack), NSTEMI (partial blockage heart attack), unstable angina (heart pain at rest or getting worse), aortic dissection (tear in the body's biggest artery), pulmonary embolism (a clot lodging in a lung artery) (blood clot in the lung), cardiac tamponade (the heart squeezed by fluid around it) (blood or fluid squeezing the heart so it cannot fill), tension pneumothorax (air trapped in the chest pushing the heart sideways), and esophageal rupture (hole torn in the swallowing tube).
Cardiology
CHF · Heart Failure Decompensation
The heart's pumping power fails, so blood and fluid back up into the lungs and body while organs struggle to get enough oxygen.
Cardiology / Primary Care
Chronic Hypertension
Blood pressure stays high for months or years, quietly damaging the heart, brain, kidneys, and eyes.
Clinical Reasoning
Chronic Hypertension in Pregnancy
Blood pressure was already high before pregnancy or climbed before twenty weeks — the blood vessels were damaged before the baby even arrived.
Cardiology
Coronary Artery Disease
Coronary artery disease is fatty plaques blocking the arteries that feed the heart muscle, creating a mismatch between oxygen supply and oxygen demand that causes chest pain, heart attacks, and heart failure.
Hematology
DVT · Deep Vein Thrombosis
A blood clot forms inside a deep vein—usually in the leg—blocking normal blood flow back to the heart.
Clinical Reasoning
DVT and PE
A blood clot forms in a deep vein (usually the leg), and if it breaks loose and travels to the lung, it becomes a PE (pulmonary a traveling clot lodging in a vessel (embolism))—both are part of the same disease process called VTE (venous thromboembolism).
Hematology
Factor V Leiden
Factor V Leiden is a genetic mutation that makes factor V resistant to protein C degradation, shifting the coagulation balance toward clot formation.
Clinical Reasoning
Gestational Hypertension
Blood pressure 140/90 or higher after 20 weeks of pregnancy with no protein in the urine and no organ damage.
Cardiovascular · Critical care
Heart Failure Exacerbation
The weakened heart cannot pump blood forward fast enough, so fluid backs up into the lungs, legs, or belly—leaving the person gasping for air and exhausted.
Clinical Reasoning
Heart rehab
Heart rehab is a doctor-watched program that helps you safely get stronger after a heart attack, heart surgery, or other heart problem by teaching you how to exercise, control the things that hurt your heart, and lower your chance of it happening again.
Cardiology / Primary Care
Hyperlipidemia
In hyperlipidemia, the bedside team that spots silent vascular risk early — checking lipids, blood pressure, and family history — outperforms the team that waits for a stroke or heart attack.
Cardiology / Emergency
Hypertensive Emergency
Blood pressure spikes so high that organs start getting damaged in real time.
Clinical Reasoning
Infective Endocarditis
Bacteria land on a heart valve, stick there, and grow a clump of germs and clotted blood that damages the valve and scatters pieces into the bloodstream.
Cardiology
Marfan Syndrome
Marfan syndrome is a connective tissue disorder caused by defective fibrillin-1 protein, leading to fragile elastic fibers in the aorta, eyes, and skeleton that stretch and tear under normal body stress.
Clinical Reasoning
Myocarditis
Inflammation damages the heart muscle cells, weakening the heart's pump and triggering dangerous rhythms.
Endocrine / Cardiometabolic
Obesity
Obesity is a chronic disease in which the body stores too much fat — defined as a body mass index (BMI) of 30 or higher, or lower BMI with weight-related health problems.
Clinical Reasoning
Pericarditis
The sac around the heart is swollen and irritated.
Pulmonology
PH · Pulmonary Hypertension
Five types by cause: blood vessel wall thickening (type 1), left heart backup (type 2), lung disease (type 3), clot blockage (type 4), or mixed (type 5) — all raise pressure in the lung arteries and wear out the right heart.
Clinical Reasoning
Portal Hypertension and Varices
Scarring inside the liver blocks blood flow and raises pressure in the portal vein, making veins in the esophagus and stomach swell and burst.
Clinical Reasoning
Post Cardiac Arrest Care
The heart has been restarted after stopping, but the brain and heart are now hurt and fragile, and the next hours decide whether the person wakes up and lives.
Clinical Reasoning
Postpartum Cardiomyopathy
The heart muscle weakens suddenly in the last month of pregnancy or up to five months after delivery, for no known reason.
Pulmonology
Pulmonary Embolism
A blood clot has traveled from somewhere else in the body and is now stuck in the pulmonary arteries (the blood vessels that feed the lungs).
Clinical Reasoning
Slow heartbeat
The heart beats too slowly to pump enough blood for the body's needs.
Clinical Reasoning
Stable CAD and Chronic Angina
Stable coronary artery disease (CAD) means plaque has narrowed the heart's arteries, causing chest pain or pressure with exercise that stops when you rest — fix it with aspirin, a statin, blood-pressure control, and sometimes a procedure to open the artery.
Clinical Reasoning
Supraventricular Tachycardia
An electrical signal spins in a loop above the ventricles, making the heart race uncontrollably.
Clinical Reasoning
Syncope and Orthostatic Hypotension
In fainting (syncope) and orthostatic low blood pressure (hypotension), the bedside team that catches the cluster early — standing blood-pressure check plus careful history plus an ECG — outperforms the team that orders every scan and waits.
Clinical Reasoning
Unstable tachyarrhythmia
The heart is beating so fast that it cannot fill with blood between beats, so the amount of blood pumped out drops and the body goes into shock.
Clinical Reasoning
Ventricular Tachycardia and Ventricular Fibrillation
The heart's lower chambers fire too fast (ventricular a fast heart rate (tachycardia)) or shake chaotically (ventricular fibrillation), stopping all blood flow. If the person has no pulse, shock immediately at 200 joules biphasic, do CPR, give epinephrine and amiodarone per ACLS.
Clinical Reasoning
VTE in pregnancy
Pregnancy makes blood clot more easily, so clots can form in leg veins and break off into the lungs.
Clinical Reasoning
VTE Prevention
Hospital patients need their clot risk checked with validated scoring tools, then given medicine or compression devices to stop blood clots from forming.
Pulmonary · Infection
Acute Bronchitis
A virus swells the big breathing tubes (bronchi), making them pour out extra mucus and setting off a cough that can last up to three weeks. It is almost never bacteria, so antibiotics do not help.
Hematology / Pulmonary
Acute Chest Syndrome
A person with sickle cell disease gets a new cloudy spot on a chest x-ray plus fever, chest pain, or low oxygen—this is acute chest syndrome, a life-threatening lung emergency.
Clinical Reasoning
Acute Dyspnea
When someone suddenly cannot breathe, give oxygen right away, then figure out why.
Clinical Reasoning
Acute Hypercapnic Respiratory Failure
The lungs cannot blow off enough CO₂ (carbon dioxide, the waste gas your body makes every second), so it builds up in the blood and makes the blood too acidic (pH drops below 7.35)—this is called too much acid in the blood (acidosis).
Clinical Reasoning
Acute Hypoxemic Respiratory Failure
The lungs cannot push enough oxygen into the blood, even when the person breathes harder.
Clinical Reasoning
Acute Upper Airway Obstruction
Something blocks the passage that brings air from the nose and mouth down into the windpipe, so air cannot reach the lungs.
Clinical Reasoning
ARDS · Acute Respiratory Distress Syndrome
Something—infection, breathing in stomach contents, major injury, bad blood transfusion, or other insult—damages the paper-thin wall between air sacs and blood vessels, so protein-rich fluid floods the air sacs and oxygen cannot cross into the blood.
Clinical Reasoning
Aspiration Pneumonia and Pneumonitis
Aspiration is when stomach contents, saliva, or food slip past the voice box and drop into the lungs instead of sliding down the food tube into the stomach.
Pulmonary · Allergy
Asthma Exacerbation
The airways clamp shut (smooth muscle spasm), swell up (inflammation led by IgE, mast cells, eosinophils, and leukotrienes), and fill with thick sticky mucus—air cannot get through.
Clinical Reasoning
Child Abuse and Neglect Recognition
Think abuse when the injury story does not match the injury itself or what a child that age can do.
Clinical Reasoning
Chronic Asthma
Long-lasting swelling inside the breathing tubes makes them twitchy and narrow, causing repeated bouts of wheezing, cough, and hard breathing that get better with medicine.
Pulmonary · Infection
Community-Acquired Pneumonia
A germ (most often a bacterium called Streptococcus pneumoniae) gets into the tiny air sacs of the lung; the immune system floods those sacs with pus and liquid so oxygen cannot cross into the blood.
Pulmonology
COPD · Chronic Obstructive Pulmonary Disease
Air goes in but cannot come back out.
Clinical Reasoning
COPD Exacerbation
The patient's airways are already narrow from long-term damage, and now something (usually an infection) has made them even tighter and filled with mucus.
Clinical Reasoning
Croup
Croup is a viral infection that swells the airway just below the voice box, making a child's breathing sound like a seal barking.
Clinical Reasoning
Croup and Bronchiolitis
Croup and bronchiolitis are both viral infections in young children — croup swells the upper airway just below the voice box and causes a barking cough and a high-pitched noise on breathing in (stridor), while bronchiolitis inflames the tiny lower airways and causes wheezing and fast breathing.
Clinical Reasoning
Hemoptysis
Blood is coming from the lower airway — the breathing tubes and lungs — not the nose, mouth, or throat.
Clinical Reasoning
Hospital Acquired and Ventilator Associated Pneumonia
A lung infection that starts 48 hours or more after someone goes into the hospital (HAP) or after a breathing tube is placed (VAP), usually caused by tough germs that live in hospitals.
Clinical Reasoning
ILD · Interstitial Lung Disease And Pulmonary Fibrosis
Interstitial lung disease is long-lasting swelling and scarring in the thin space between the air sacs, making it hard for oxygen to jump into the blood.
Clinical Reasoning
Multisystem Inflammatory Syndrome in Children
A child's immune system misfires 2–6 weeks after COVID, attacking the body instead of finishing cleanup — inflammation floods everywhere at once, mimicking Kawasaki disease but hitting older kids harder.
Clinical Reasoning
Obstructive Sleep Apnea and Obesity Hypoventilation
Obesity hypoventilation syndrome means a person is very obese and their body does not blow off enough carbon dioxide during the day, even when they are awake.
Clinical Reasoning
OSA · Sleep Apnea
Your throat collapses over and over while you sleep, choking off air until your brain wakes you up gasping — CPAP holds it open so you can breathe all night.
Clinical Reasoning
Pleural Effusion and Empyema
Fluid has pooled in the space between the lung and the chest wall, squeezing the lung so it cannot fill with air.
Clinical Reasoning
Pneumothorax and Tension Pneumothorax
A pneumothorax is air inside the chest that does not belong there, and it squeezes the lung so the lung cannot fill with air the way it should.
Clinical Reasoning
Pulmonary Edema
In pulmonary edema (fluid flooding the lungs), the bedside team that catches the cluster early — frothy coughed-up mucus (sputum), crackles on exam, low oxygen, and a single chest X-ray or ultrasound — saves more lives than the team that waits for every lab to return.
Pulmonology
Status Asthmaticus
Severe asthma attack that does not get better with the first breathing medicines and steroids.
Clinical Reasoning
Tuberculosis
M. tuberculosis is a slow-moving bacteria that hides inside immune cells, causing lung sickness and sometimes spreading to other organs.
MSK / Rheumatology
Acute Back Pain
Most sudden back pain comes from a pulled muscle, stretched ligament, or a disc that has shifted in the lower back, and it gets better on its own within 4 to 6 weeks without scans or surgery.
Clinical Reasoning
Acute Intracranial Bleed
Blood leaks into the skull where it does not belong, raising pressure in a rigid box that cannot stretch to make room.
Neurology · Emergency
Acute Ischemic Stroke
A clot plugs an artery inside the brain, cutting off oxygen; the brain cells fed by that artery start dying within minutes because the brain has no backup fuel tank.
Clinical Reasoning
Acute Low Back Pain and Red Flags
Nine out of ten people with new back pain have a pulled muscle or sprained joint that heals on its own in four to six weeks, but red-flag warning signs—fever, nighttime pain that wakes you from sleep, numbness around your groin and buttocks, new trouble peeing or pooping, weakness in both legs, or severe pain in older adults—can point to a broken bone, spine infection, cancer spread, crushed nerve bundle, or a leaking belly artery that needs fast action to prevent permanent harm.
Infectious disease / neuro
Bacterial Meningitis
Bacteria invade the cerebrospinal fluid (the protective liquid cushion around the brain and spinal cord), triggering life-threatening inflammation of the brain's lining.
Clinical Reasoning
Bone infection
Bone gets infected when bacteria arrive from a nearby wound, surgery, or the bloodstream and multiply faster than the body can fight them off.
Clinical Reasoning
BPSD · Dementia Care And Behavioral Symptoms
Behavior and mood problems in dementia are usually the body's way of saying something physical is wrong — pain, infection, constipation, full bladder, scary place, or bad medicine — not just 'the brain getting worse.'
Clinical Reasoning
Brain Tumors and Neurologic Oncology Symptoms
A growing lump inside the skull causes trouble in three ways: it crushes or invades the brain tissue where it sits (causing weakness or speech problems in that exact spot), it takes up space and raises pressure inside the rigid skull (causing morning headaches and vomiting), and it irritates nearby brain cells (triggering seizures).
Clinical Reasoning
Cord compression
Something (tumor, infection pocket, blood clot, ruptured cushion, or broken bone) is squeezing the spinal cord inside its bony tunnel, cutting off the nerve signals that run your legs, bladder, and feeling below that squeeze point.
Clinical Reasoning
Delirium and Metabolic Encephalopathy
The brain suddenly stops thinking clearly and the confusion comes and goes within hours, almost always because something fixable—medicine, infection, dehydration, or broken chemistry—is attacking the brain right now.
Clinical Reasoning
Delirium Prevention
Find patients who might become confused in the hospital, then use simple, non-drug steps to keep their brain organized before delirium starts.
Mental Health & Substance Use
Delirium Versus Dementia Versus Psychosis
Delirium is a sudden break in attention that flips on and off — and you can fix it. Dementia is a slow, steady loss of thinking that doesn't come back. Psychosis is seeing or believing things that aren't real.
Neurology
Dementia
Dementia is lasting brain decline that steals memory, thinking, and independence — and Alzheimer disease causes most cases.
Clinical Reasoning
Encephalitis
A virus sneaks into brain tissue—or the body's defense system mistakenly attacks the brain—and both cause the brain to swell inside the hard skull.
Clinical Reasoning
Falls and Syncope
When older people fall or pass out, something upstream is broken—find it and fix it before the next fall breaks a bone or the next faint stops the heart for good.
Clinical Reasoning
Guillain Barr Syndrome
After an infection, the immune system attacks the myelin (the fatty wrap that insulates nerves), causing weakness that climbs from the feet upward and knocks out reflexes.
Environmental
Heat Stroke
Body temperature climbs above 104°F (40°C) and the brain stops working right — cooling within minutes can save the person's life.
Hepatology
Hepatic Encephalopathy
The liver is not cleaning ammonia and other toxic waste from the blood, so poison reaches the brain.
Clinical Reasoning
Intracerebral Hemorrhage
A blood vessel inside the brain bursts and bleeds into the brain tissue itself.
Clinical Reasoning
Intracranial Hemorrhage
Bleeding inside the skull can happen in four spaces—inside brain tissue (intracerebral), around the surface of the brain (subarachnoid), between the brain and the dura (subdural), or between the dura and the skull (epidural)—and where the blood lands tells you what broke and what to do.
Clinical Reasoning
Malignant Spinal Cord Compression
A tumor presses on the spinal cord and cuts off its signals.
Clinical Reasoning
Meningitis
Bacteria have crossed into the subarachnoid space and turned the cerebrospinal fluid into an abscess.
Neurology
Migraine
Migraine is a brain disorder where waves of electrical noise and swelling in blood vessels cause headaches that come back again and again, often with warning signs and strange sensory symptoms.
Clinical Reasoning
Migraine and Headache Red Flags
Migraine is a brain disorder where waves of overactive nerve signals cause severe head pain (usually on one side), often with light and sound sensitivity, nausea, and sometimes vision changes. Some headaches hide dangerous causes like bleeding in the brain, infection, stroke, or torn blood vessels — so we always check for red flags first.
Clinical Reasoning
MS · Multiple Sclerosis
The immune system attacks the protective coating around nerve fibers in the brain and spinal cord, scrambling signals and causing unpredictable symptoms that come and go.
Clinical Reasoning
Myasthenia Gravis
The immune system makes antibodies that block or destroy acetylcholine receptors at the neuromuscular junction (the tiny gap where a nerve ending talks to a muscle fiber), so the nerve's 'contract now' signal cannot get through.
Endocrine emergencies
Myxedema Coma
The thyroid has stopped working, and the patient's whole body is shutting down.
Clinical Reasoning
Neurocognitive Disorders
In neurocognitive disorders, the team that spots early memory loss, asks one good screen question, and checks for reversible causes outperforms the team that assumes it's just old age.
Clinical Reasoning
Parkinson Disease
Dopamine-making cells in the substantia nigra (the brain's movement-control station) are dying, so your body loses the chemical signal it needs to start and smooth out movement.
Neurology
Parkinsons Disease
The substantia nigra (a small dark spot deep in the brain that makes dopamine) loses its dopamine-making nerve cells, so the brain cannot send smooth movement signals anymore.
Clinical Reasoning
Peripheral Neuropathy
The long wires that carry messages from your brain to your toes and fingers are breaking down.
Clinical Reasoning
Seizure and Status Epilepticus Stabilization
A seizure that lasts longer than 5 minutes, or seizures that come back without the person waking up in between, is status epilepticus (a seizure that will not stop) — a brain emergency that needs medicine right away.
Clinical Reasoning
Seizure Disorder
First figure out whether the seizure starts in one spot (focal) or everywhere at once (generalized), because that split steers every choice you make next.
Clinical Reasoning
Spinal Cord Compression and Cauda Equina
A disc, tumor, blood clot, or infection squeezes the bundle of nerves at the bottom of the spine, cutting off the signals that control your legs, bladder, bowels, and saddle area all at once.
Neurology
Status Epilepticus
A seizure that lasts more than 5 minutes is status epilepticus (a seizure that will not stop) — a brain emergency that can kill cells if it is not stopped fast.
Clinical Reasoning
Stroke Activation
When brain tissue is starving for blood, every minute counts — fast action can save brain cells and reverse damage.
Neurology
Stroke Window
A clot is blocking an artery in the brain, killing brain tissue minute by minute.
Clinical Reasoning
Syncope (fainting)
Fainting (Syncope) is a sudden, brief loss of consciousness caused by not enough blood reaching the brain, with full recovery once blood flow returns.
Neurology / Trauma
TBI · Traumatic Brain Injury
The brain gets hurt at the moment of impact, then can get hurt again from swelling and pressure afterward.
Clinical Reasoning
TIA · Transient Ischemic Attack
A blood clot briefly plugs a brain artery, then breaks apart before brain cells die—but the next clot might not dissolve in time.
Hematology
Vitamin B12 Deficiency & Pernicious Anemia
Without intrinsic factor or adequate B12 absorption, the body cannot make healthy red blood cells or maintain nerve sheaths, leading to macrocytic anemia and irreversible neurologic damage if untreated.
Neurology / Nutrition
Wernicke Encephalopathy
Wernicke encephalopathy happens when the body runs out of thiamine (vitamin B1), usually from heavy alcohol use, poor eating, repeated vomiting, stomach surgery, or refeeding after starvation—and giving sugar without thiamine first makes it worse.
Clinical Reasoning
Acute Abdomen
Acute abdomen is sudden, severe belly pain with signs that the belly lining is angry and inflamed — a surgical emergency until proven otherwise.
Clinical Reasoning
Acute Cholangitis
A gallstone, scar, or tumor blocks the bile duct so bile cannot drain; bacteria from the intestine swim up into the trapped bile and multiply, then high pressure pushes infected bile into the bloodstream — turning a plumbing problem into a body-wide infection.
GI / Hepatic
Acute Cholecystitis
A gallstone plugs the cystic duct (the narrow tube that drains the gallbladder), trapping bile inside so pressure climbs, the wall swells, and bacteria multiply—turning a simple blockage into an infected, inflamed gallbladder that may die, tear, or spill into the belly if not drained or removed.
Hepatology
Acute Liver Failure
Acute liver failure means most of your liver cells suddenly die within 26 weeks, stopping the liver from making clotting proteins (so you bleed easily) and clearing ammonia (so your brain becomes confused)—in someone whose liver was healthy before.
Clinical Reasoning
Acute Mesenteric Ischemia
Blood flow to the intestines suddenly stops—usually because a clot breaks loose from the heart and plugs the main gut artery—and the bowel starts dying within hours.
Gastroenterology
Acute Pancreatitis
Digestive enzymes wake up too early—inside the pancreas instead of waiting until they reach the small intestine—so the gland starts digesting itself.
Clinical Reasoning
Appendicitis
When the appendix tube gets blocked, pressure rises inside it, blood flow drops, bacteria multiply, the wall dies, and if it ruptures, germs spill into the belly.
Clinical Reasoning
Ascites and Spontaneous Bacterial Peritonitis
Spontaneous bacterial peritonitis (SBP) is a bacterial infection of belly fluid (ascites) that happens when gut bacteria slip into the fluid—no hole in the bowel or other source you can fix with surgery.
Infectious disease
C · C Diff
C. difficile (a harmful germ) took over your gut after antibiotics wiped out the good bacteria that normally keep it under control.
Clinical Reasoning
C · C Difficile Infection
C. difficile takes over the colon when antibiotics kill the good bacteria that normally keep it in check.
Clinical Reasoning
Chronic Venous and Arterial Ulcers
Venous ulcers sit above the inner ankle with brown staining and swelling; arterial ulcers are pale, deep, and extremely painful; both need prompt care to heal and protect the leg.
Hepatology
Cirrhosis
Long-term injury from alcohol, viral hepatitis, fatty liver disease, autoimmune attack, or inherited metal and metabolic problems slowly replaces healthy liver cells with hard scar tissue and bumpy regeneration nodules that cannot do the liver's work.
Clinical Reasoning
Cirrhosis with Decompensation
A scarred liver that can no longer hold things together.
Hepatology
Cirrhosis-Associated Coagulation Dysfunction
Cirrhosis creates a rebalanced but fragile coagulation system where both clotting and bleeding risks coexist because the liver can no longer make normal amounts of pro-clotting and anti-clotting proteins.
Clinical Reasoning
Diabetic Foot Ulcer and Wound Care
Lost feeling plus poor blood flow plus repeated rubbing equals a wound that does not heal.
Clinical Reasoning
Diverticulitis
A diverticulum is a tiny pouch that pushes out through a weak spot in the colon wall, and diverticulitis is when that pouch gets blocked, swells up, and tears or gets infected.
Clinical Reasoning
Gastroenteritis and Dehydration
A germ (virus or bacteria) inflames the gut, causing vomiting and diarrhea that pour water and salt out of the body—dehydration is the real danger.
Gastroenterology
GERD · Gastroesophageal Reflux Disease
Stomach acid flows backward into the food tube, burning it over and over.
Clinical Reasoning
GERD and Peptic Ulcer Disease
GERD and peptic ulcer disease happen when stomach acid ends up in the wrong place — either splashing up into the esophagus (the food tube) or eating a hole in the stomach or duodenum (the first part of the small intestine).
Gastroenterology
GI Bleed
Bleeding anywhere along the stomach or intestines—from the esophagus down to the rectum—that can silently drain blood until shock arrives.
Clinical Reasoning
Hepatitis B
Hepatitis B is a virus that attacks liver cells and spreads through blood, sex, or from mother to baby during birth.
Clinical Reasoning
Hepatitis C
Hepatitis C is a virus that spreads through blood and quietly damages the liver over many years.
GI / Hepatic
IBD · Inflammatory Bowel Disease
The immune system mistakenly attacks the gut lining over and over, causing long-lasting swelling and damage.
Clinical Reasoning
Irritable Bowel Syndrome
Belly pain that comes back again and again, paired with a change in how often you poop or what your poop looks like, lasting more than 3 months, with no warning signs of bleeding, weight loss, or serious disease.
Clinical Reasoning
Lower GI Bleed
Bleeding from anywhere in the gut below the ligament of Treitz (the first bend of the small intestine, right past the stomach).
Gastroenterology
PUD and GERD
Acid belongs in the stomach, where a thick mucus shield protects the lining from being burned.
Clinical Reasoning
Small Bowel Obstruction
Scar tissue from past surgery is the most common reason the small bowel gets blocked.
Clinical Reasoning
Upper GI Bleed
Bleeding from the esophagus, stomach, or the first part of the small intestine—above the ligament of Treitz (the bend where the small intestine starts)—floods the gut with blood and drops the body's total blood volume fast.
Clinical Reasoning
Viral Hepatitis
A virus sneaks into liver cells, your immune system fights back hard, and the battle makes you tired, yellow, and sick—but most people win and heal completely.
Clinical Reasoning
Acid-base
For every blood gas, ask: which way is pH moving, is the main problem CO₂ or bicarbonate, is the body fixing it the right amount, does anion gap show hidden acids, then fix what broke—not the number itself.
Nephrology
Acute GN
The glomerulus (kidney filter) is under immune attack, and its leaky barrier is letting blood and protein spill into the urine.
Renal · Critical care
Acute Kidney Injury
The kidneys suddenly stop cleaning the blood fast enough—waste piles up, salt and water go out of balance, and every organ starts to feel it within hours to days.
Clinical Reasoning
Acute Urinary Retention
The bladder is full and cannot empty, causing pain above the pubic bone and risking kidney damage from back-pressure.
Endocrine emergencies
Adrenal Crisis
Cortisol helps blood vessels squeeze when you are stressed, tells your liver to make sugar for energy, and keeps your body balanced during illness or injury.
Clinical Reasoning
Adrenal insufficiency
Adrenal insufficiency means the adrenal glands make too little cortisol (the hormone that keeps your blood pressure steady and your blood sugar normal when you are stressed) and often too little aldosterone (the hormone that holds onto salt and water so your blood pressure does not drop).
Hematology
Anemia of Chronic Kidney Disease
Failing kidneys cannot make enough erythropoietin, so the bone marrow starves for the signal it needs to produce red blood cells.
Genitourinary
Benign Prostatic Hyperplasia
The prostate gland slowly grows larger with age and squeezes the urethra (the tube that carries urine out), so the bladder must push harder to empty.
Clinical Reasoning
Blood in urine
Blood in urine is never normal and always needs a doctor to find out why.
Clinical Reasoning
BPH and Lower Urinary Tract Symptoms
Benign prostatic hyperplasia (non-cancerous prostate growth) squeezes the urethra (the tube that drains urine from the bladder), blocking urine flow and causing both trouble emptying (weak stream, hesitancy) and trouble storing (urgency, frequency, waking at night).
Clinical Reasoning
BPH LUTS
Benign prostatic hyperplasia (BPH) (non-cancerous growth of the prostate gland) squeezes the urethra (the tube that drains urine from the bladder), causing weak stream, frequent trips to the bathroom, sudden urges, nighttime wake-ups to urinate, and a bladder that never feels fully empty.
Clinical Reasoning
CAUTI · Catheter-Associated UTI
When a catheter stays in the bladder, bacteria stick to it, grow, and then attack the bladder tissue — that attack is the infection.
Clinical Reasoning
CAUTI Prevention
Most bladder-catheter infections can be stopped before they start.
Clinical Reasoning
CKD · Chronic Kidney Disease
The kidneys have been losing their cleaning power slowly, over months or years, and they cannot heal back.
Endocrine · Critical care
Diabetic Ketoacidosis
No insulin → sugar cannot enter cells → body burns fat for fuel → fat breakdown creates acids (ketones) that make the blood acidic.
Clinical Reasoning
ESRD & Dialysis Complications
When kidneys fail completely, the body cannot clean the blood or balance fluids and minerals—only dialysis or a transplant can do that job.
Neurology
Huntington Disease
Huntington disease is an inherited brain disorder where mutant huntingtin protein kills neurons in the striatum, causing progressive movement problems, dementia, and psychiatric symptoms with no cure.
Electrolytes
Hyperkalemia
Too much potassium in the blood shrinks the voltage gap heart muscle cells need to beat reliably.
Clinical Reasoning
Hypernatremia
Sodium level is high because the body has too little water compared to salt.
Clinical Reasoning
Hypocalcemia and Hypercalcemia
Calcium keeps muscles and nerves firing smoothly; when it's off, everything from your heartbeat to your brain misfires.
Clinical Reasoning
Hypokalemia
Not enough potassium in the blood — the heart and muscles are at risk.
Clinical Reasoning
Hyponatremia
Low sodium (Hyponatremia) means too much water diluting the blood, not too little sodium—the kidney either kept water it should have dumped, or the body lost salt faster than water.
Clinical Reasoning
Hypophosphatemia and Hyperphosphatemia
Low phosphorus (from refeeding, heavy alcohol use, or diabetic ketoacidosis (the acid crisis of missing insulin) recovery) stops cells from making energy and delivering oxygen, which leads to weak muscles, stopped breathing, and muscle breakdown. High phosphorus (from kidney failure or massive cell death) pulls calcium out of the blood and deposits it in tissues, causing stiff muscles and dangerously low calcium.
Neurology / Emergency
Increased ICP (pressure in brain)
The skull is a closed box — nothing can expand inside without crushing something else.
Genitourinary
Kidney Stone (Ureterolithiasis)
A tiny rock slides down the drain from kidney to bladder and gets wedged in the pipe, so the kidney backs up and the body screams.
Clinical Reasoning
Kidney type of DI
The kidney cannot hear ADH's command to save water, so it makes huge amounts of watery pee no matter what the body needs.
Clinical Reasoning
Mg (magnesium) disorders
Low magnesium (Mg) from diuretics, alcohol, PPIs, or diarrhea causes stubborn low potassium (K) that won't fix and low calcium (Ca), and can trigger torsades de pointes (a deadly spinning heart rhythm).
Clinical Reasoning
Nephritic Syndrome and Glomerulonephritis
In nephritic syndrome and glomerulonephritis, the team that catches the triad—blood in the urine (hematuria), high blood pressure (hypertension), and swelling (edema)—at the bedside wins before the biopsy returns.
Nephrology
Nephrotic Syndrome
The kidney's filter broke and now protein leaks out, so the blood loses what it needs to hold fluid inside vessels.
Clinical Reasoning
Prostate Cancer
Prostate cancer is very common, usually grows slowly, and often needs watching more than treating right away.
Clinical Reasoning
Pyelonephritis
Pyelonephritis is when bacteria (usually from the bladder) travel up into the kidney tissue and cause infection there.
Clinical Reasoning
Severe Hyperkalemia with ECG Changes
Potassium above 6.5 with heart-rhythm changes on the electrocardiogram (ECG) — this is a true emergency that can stop the heart in minutes.
Clinical Reasoning
Severe hypokalemia
Potassium below 2.5 mEq/L or any level with life-threatening signs like dangerous heartbeats, muscle paralysis, or breathing trouble.
Clinical Reasoning
Swelling of the prostate
Bacteria invade the prostate and trigger swelling, pain when you pee, pain between the legs, fever, and a tender puffy gland on exam.
Pharmacology · Genitourinary
Tamsulosin
Tamsulosin is a pill that blocks alpha-1A receptors—the 'tighten' switches on smooth muscle around the prostate and bladder neck—so the gate opens and urine flows out without a fight.
Urology Emergency
Testis twists
The spermatic cord twists, cutting off blood to the testicle so it starts to die.
Clinical Reasoning
Uncomplicated UTI and Cystitis
Bacteria climb into the bladder and stick to the lining, making you pee a lot, rush to the bathroom, and feel burning pain when you go.
Clinical Reasoning
Central DI
The back part of the pituitary gland stops releasing enough ADH (the hormone that tells your kidneys to save water), so the kidneys dump huge amounts of pale, watery urine and the body gets dangerously thirsty.
Clinical Reasoning
Cushing Syndrome
Way too much cortisol flooding the body, no matter where it comes from.
Clinical Reasoning
Diabetes Insipidus
The body cannot hold onto water because either the brain stops making ADH (the hormone that tells kidneys to keep water in) or the kidneys ignore the ADH signal.
Endocrine
Diabetes Insipidus & SIADH
DI happens when your body makes too little ADH or your kidneys ignore it, so water floods out in your pee.
Maternity
Gestational Diabetes
Blood sugar shoots up during pregnancy when the pancreas cannot make enough insulin to keep up with the body's new, higher demand.
Clinical Reasoning
HHS · Hyperosmolar Hyperglycemic State
Blood sugar shoots above 600 mg/dL, blood turns thick like syrup, and the brain gets confused — but no big acid buildup like in DKA.
Clinical Reasoning
Hyperthyroidism
Thyroid hormone is your body's speed dial — it sets how fast your heart beats, how much heat you make, and how quickly you burn food for energy.
Endocrine emergencies
Hypoglycemia
Blood sugar below 70 mg/dL with symptoms, or below 55 mg/dL even without symptoms, means the brain and body are starving for fuel right now.
Endocrine
Hypothyroidism
The thyroid gland stops making enough hormone, so the whole body slows down—energy, warmth, digestion, heart rate, and mood all drop because every cell needs thyroid hormone to run at normal speed.
Clinical Reasoning
Hypothyroidism Severe
This is a life-threatening drop in thyroid hormone that shuts down the body's engine.
Clinical Reasoning
Neonatal Hypoglycemia
A newborn's blood sugar below 47 mg/dL after the first hour of life is dangerously low and the brain can be hurt if it stays low.
Endocrine
Pheochromocytoma
A tumor of chromaffin cells (usually in the adrenal gland) dumps bursts of adrenaline and noradrenaline into the blood.
Clinical Reasoning
SIADH · Syndrome of Inappropriate ADH
The body releases too much ADH hormone even when it should not, so the kidneys hold extra water and blood salt drops dangerously low.
Endocrine emergencies
Thyroid Storm
Thyroid storm is a life-threatening crisis when way too much thyroid hormone floods the body all at once.
Endocrine
Type 1 Diabetes
The immune system destroys the insulin-making cells in the pancreas, so the body can never bring blood sugar into cells without outside insulin.
Endocrine
Type 2 Diabetes
The body's cells ignore insulin's signal, and the pancreas cannot make enough to overcome that silence.
Clinical Reasoning
Anemia of Chronic Disease
Chronic inflammation raises hepcidin (a liver hormone that locks iron inside storage cells) so the bone marrow cannot reach that iron to build red blood cells, even though total body iron is normal or high.
Clinical Reasoning
Aplastic Anemia
The bone marrow factory stops making red cells, white cells, and platelets — usually because the body's own immune cells attack the stem cells or toxic chemicals and drugs destroy them.
Hematology
Autoimmune Hemolytic Anemia
The immune system mistakes the patient's own red blood cells for foreign invaders and destroys them faster than the bone marrow can replace them.
Clinical Reasoning
Blood thinners
Blood thinners slow down clotting by blocking specific proteins in the clotting chain, preventing dangerous clots but raising the risk of bleeding.
Clinical Reasoning
Breast Cancer
Breast cancer survival depends on catching it early and knowing the exact type, because each type responds to different treatments.
Clinical Reasoning
Cancer Pain and Palliative Care
Cancer pain is not just one thing — it hurts the body, the mind, the spirit, and the connections people need to feel whole.
Clinical Reasoning
Cancer survivorship
Cancer survivorship is the phase after treatment ends, when the body is healing but still at risk for late side effects, cancer coming back, or new cancers.
Clinical Reasoning
Cervical and Hpv Associated Cancer
High-risk HPV (types 16 and 18) causes nearly all cervical cancer, plus cancers of the throat, anus, vulva, vagina, and penis by hiding in cells for years and breaking normal growth rules.
Clinical Reasoning
Chemotherapy Safety and Extravasation
When chemotherapy leaks out of the vein into the tissue around it, some drugs can kill that tissue and leave a serious wound.
Clinical Reasoning
Colorectal Cancer
Cells in the colon or rectum pick up broken genes over many years until they ignore all stop signals and grow out of control.
Hematology emergencies
DIC · Disseminated Intravascular Coagulation
The blood's clotting system turned on everywhere at once.
Hematology
Folate Deficiency Anemia
Without enough folate, the bone marrow makes too few red blood cells that are too big and too fragile to carry oxygen properly.
Clinical Reasoning
Hemolytic Anemia
Red blood cells are dying too fast — look for high LDH, low haptoglobin, high indirect bilirubin, and lots of young red cells (reticulocytes) trying to replace them.
Hematology / Oncology
Hereditary Breast & Ovarian Cancer (BRCA)
BRCA mutations disable critical DNA repair mechanisms, allowing cancer-causing genetic errors to accumulate unchecked in breast and ovarian tissues.
Clinical Reasoning
Iron Deficiency Anemia
Iron deficiency anemia happens when the body runs out of iron, so red blood cells become too small and pale to carry enough oxygen.
Clinical Reasoning
Leukemia and Lymphoma
Leukemia is when one white blood cell in the bone marrow loses its growth controls and multiplies out of control, crowding out normal blood cells.
Clinical Reasoning
Low platelets or ITP
Find what caused it — drug, infection, bone marrow disease, big spleen, or immune system attack.
Clinical Reasoning
Lung Cancer
Lung cancer kills more people than any other cancer — and most cases start with cigarette smoke damaging the DNA in lung cells until one cell breaks free and multiplies without stopping.
Hematology
Microangiopathic Hemolytic Anemia (MAHA)
MAHA is red blood cell destruction (hemolysis) caused by red blood cells being physically sheared apart as they squeeze through abnormal clots or damaged tiny blood vessels.
Clinical Reasoning
Multiple Myeloma
One clone of plasma cells has broken free and is flooding the blood with one antibody (the M-protein) while crowding out healthy blood cells, dissolving bone, and clogging the kidneys.
Mental Health & Substance Use
Neuroleptic Malignant Syndrome
High fever plus stiff muscles that feel like lead pipes plus confused brain plus wild body signs plus high muscle enzyme after antipsychotic drugs.
Clinical Reasoning
Neutropenia
Too few neutrophils (the white blood cells that fight bacteria) lets infections happen easily and turn deadly fast.
Clinical Reasoning
Neutropenic Fever
Fever in a patient whose neutrophil count is below 500 cells per microliter—no white blood cell army left to fight infection.
Hematology
Sickle Cell Crisis
When oxygen drops, hemoglobin S (the sickle version of the oxygen-carrying protein) turns stiff and sharp, bending red blood cells into a crescent or sickle shape.
Clinical Reasoning
Sickle Cell Disease
A child inherits two copies of a mutated hemoglobin gene (HbS). When oxygen runs low, the HbS protein inside red blood cells clumps together and bends the cells into a stiff crescent (sickle) shape. These sickle cells jam in small blood vessels and break apart, starving tissue and triggering pain and organ damage.
Hematology
Sickle Cell Trait
Sickle cell trait is a benign carrier state where one normal and one sickle hemoglobin gene produce enough normal hemoglobin to prevent sickling under almost all everyday conditions.
Clinical Reasoning
Testicular Cancer
A painless lump in a young man's testicle needs an ultrasound of the scrotum right away.
Hematology
Thalassemia
Thalassemia is a genetic failure to make enough of one type of hemoglobin chain, causing red blood cells to break apart too early and leading to lifelong anemia.
Clinical Reasoning
TTP and HUS
Tiny clots form throughout small blood vessels, shredding red blood cells and using up platelets.
Hematology / Oncology
Tumor Lysis Syndrome
Cancer treatment kills millions of cancer cells so fast that the kidneys cannot clear all the stuff they dump into the blood.
Clinical Reasoning
Candidemia
Candida in the bloodstream is a serious fungal infection that requires immediate antifungal treatment, usually with an echinocandin drug.
Infectious disease
Cellulitis
Bacteria are growing in the skin layers (dermis and the fat tissue just beneath it).
Clinical Reasoning
COVID-19
SARS-CoV-2 virus enters through ACE2 receptors in the airway and lungs, triggering immune swelling that ranges from mild cough to life-threatening lung failure.
Clinical Reasoning
HIV · Human Immunodeficiency Virus
HIV is a virus that gets inside CD4 cells — the white blood cells that direct your immune system — copies itself, and kills those cells one by one until your body can't fight off germs anymore.
Clinical Reasoning
Influenza
Flu is a virus that attacks the wet lining inside your nose, throat, and lungs, causing sudden fever, body aches, and cough — and high-risk people can get pneumonia fast.
Clinical Reasoning
Mens Sexual Health STI Prevention and Prep
Sexual health is real medicine — ask about it, test for it, vaccinate, and prevent what you can before it spreads or breaks something downstream.
Clinical Reasoning
NAS · Neonatal Abstinence Syndrome
A newborn whose mother took opioids during pregnancy can get very sick after birth because the baby's body became used to the drug and now has to adjust without it.
Clinical Reasoning
Necrotizing Fasciitis
Flesh-eating bacteria race along the layers between muscles, destroying tissue faster than the immune system can reach them.
Clinical Reasoning
Neonatal Sepsis
A newborn with an infection that can turn deadly fast because the baby's immune system is brand new and cannot fight germs yet.
Clinical Reasoning
Opportunistic Infections in Immunocompromised Patients
HIV (CD4-driven), transplant (time-based), neutropenic (low white cells), complement (body defense), B-cell.
Clinical Reasoning
PID · STI & Pelvic Inflammatory Disease
Bacteria from a sexually transmitted infection in the cervix climb up into the uterus, fallopian tubes, and sometimes the belly, causing infection and scarring that never fully heals.
Clinical Reasoning
Postpartum Endometritis and Sepsis
Infection in the uterus lining after delivery, usually from bacteria that climbed up during birth.
Infection · Critical care
Sepsis
An infection escapes local control and triggers body-wide alarm chemicals that make blood vessels leak and relax — pressure falls, organs starve for oxygen, and without fast treatment organs shut down.
Clinical Reasoning
Sepsis bundle
Sepsis is an infection that has triggered a harmful immune reaction, causing organs to fail — measured as a SOFA score of 2 or more.
Clinical Reasoning
Septic Arthritis
Bacteria invade the joint space, fill it with pus, and destroy cartilage fast—hours matter.
Sepsis & shock
Shock
Shock means the body cannot deliver enough oxygen-rich blood to cells, so cells start to die.
Mental Health & Substance Use
Stimulant Use and Intoxication
Cocaine, meth, or MDMA flood the brain with dopamine and norepinephrine—the heart races, blood pressure spikes, body heat soars, and thinking goes off the rails.
Clinical Reasoning
Compartment Syndrome
Pressure inside a muscle compartment rises so high that blood cannot flow in, starving the muscle and nerve of oxygen.
MSK / Rheumatology
Gout
Too much uric acid in the blood forms needle-sharp crystals in joints, causing sudden severe pain and swelling.
Clinical Reasoning
Hip Fracture
A fall breaks the top of the thigh bone where it meets the hip, especially in older adults with thin bones.
Clinical Reasoning
OA · Osteoarthritis And Chronic Pain
The slippery cartilage cushion wears away, and the bone underneath gets thick, hard, and bumpy.
MSK / Rheumatology
Osteoarthritis
The slippery cushion inside the joint has worn away, leaving bone rubbing on bone.
Clinical Reasoning
Osteoporosis and Fragility Fracture
Bones become thin and full of tiny holes inside, so they break from small bumps or falls that would never hurt a healthy person.
MSK / Rheumatology
Rheumatoid Arthritis
Your immune system is attacking the soft lining inside your joints.
Clinical Reasoning
SLE · Systemic Lupus Erythematosus
In lupus, the immune system loses its brake and makes antibodies (immune proteins) that attack the body's own tissues — skin, joints, kidneys, blood, brain, and heart lining — causing swelling and damage wherever the antibodies land.
Clinical Reasoning
Vasculitis
The immune system mistakenly attacks the walls of blood vessels, causing swelling, blockage, and bleeding that can damage any organ those vessels feed.
Clinical Reasoning
Burns
Heat, electricity, chemicals, or radiation damages or kills skin cells, breaking the body's protective barrier and triggering fluid loss, swelling, and infection risk.
Dermatology
Shingles
Shingles is chickenpox virus (VZV) waking up from nerve bundles near the spine and sliding down one nerve path to burn the skin.
Mental Health & Substance Use
Adult ADHD
A lifelong brain-wiring difference where the prefrontal cortex (the control center at the front of your brain) cannot hold enough dopamine (the brain messenger that helps you lock onto what matters and finish what you start) or norepinephrine (the brain messenger that keeps you alert and ready to act) in the tiny gaps between nerve cells, so paying attention, stopping impulses, planning tasks, remembering instructions, and sitting still all fail—at work, at home, and everywhere in between.
Mental Health & Substance Use
Alcohol Use Disorder
Alcohol Use Disorder (AUD) is diagnosed when someone shows 2 or more of 11 behaviors within 12 months—like needing more alcohol to get the same effect (tolerance), feeling sick when stopping (withdrawal), or continuing to drink despite harm to health, work, or relationships.
Clinical Reasoning
Alcohol Withdrawal & Delirium Tremens
Delirium tremens is a brain emergency that strikes 2 to 4 days after the last drink, marked by severe confusion, seeing or hearing things that are not there, and an autonomic storm — the body's normal control over heart rate, blood pressure, and temperature collapses.
Clinical Reasoning
Anxiety Disorder
Anxiety disorders (generalized anxiety disorder, panic disorder, social anxiety disorder, agoraphobia, specific phobia) all cause too much fear and avoidance, but each one has different triggers, different time patterns, and different first-line treatments proven to work.
Clinical Reasoning
Anxiety Panic
A panic attack is a sudden wave of intense fear with a racing heart, trouble breathing, chest pain, and dizziness that peaks in minutes even when there is no real danger.
Mental Health & Substance Use
Bipolar Disorder
Bipolar disorder causes repeating cycles of sky-high energy and mood (mania or hypomania) and crushing low mood (major depression), all driven by broken control of dopamine, serotonin, and norepinephrine (brain chemical messengers) in the circuits that manage emotion and drive.
Mental Health & Substance Use
Bipolar I Disorder
Bipolar I is defined by one thing: at least one manic episode — a week or more of sky-high or cranky mood with relentless energy severe enough to wreck daily life, land you in the hospital, or make you lose touch with reality. Depression usually shows up too, but mania alone makes the diagnosis.
Mental Health & Substance Use
Bipolar II Disorder
Bipolar II is depression's great impostor: the person shows up crushed by deep sadness and never mentions the energized four-day stretches that felt like their best self — and the diagnosis lives or dies on finding those highs.
Mental Health & Substance Use
Bipolar Mania
Mania is a medical emergency when the person cannot think clearly, acts dangerously, or loses touch with reality.
Mental Health & Substance Use
Cannabis Related Symptoms
Today's cannabis contains 20–30% THC (the chemical in cannabis that changes how your brain works), which is 5–10 times stronger than cannabis from 30 years ago.
Mental Health & Substance Use
Cyclothymic Disorder
Cyclothymic disorder is two years of mood swings that never become full storms—mild highs that do not reach hypomania and mild lows that do not reach major depression—yet they are present at least half the time and never pause for more than two months.
Clinical Reasoning
Depression
Depression is a medical condition in which the brain's mood and motivation systems stop working properly, causing persistent sadness, loss of interest, and changes in sleep, appetite, energy, and thinking that last at least two weeks.
Mental Health & Substance Use
Dysthymia (Persistent Depressive Disorder)
Dysthymia is depression as a climate instead of a storm — a low mood most of the day, more days than not, for at least two years, so constant that many patients stop calling it an illness and start calling it their personality.
Clinical Reasoning
Eating Disorders
Eating disorders are brain-based mental illnesses that twist how someone sees their body and eats, causing serious harm to both the mind and the body.
Mental Health & Substance Use
Generalized Anxiety Disorder
Worry that lasts more than six months, happens most days, and makes normal life hard.
Mental Health & Substance Use
Hypomania
Hypomania is a lasting 'too-high' mood that doesn't wreck daily life — and it's the clue that unmasks Bipolar II.
Mental Health & Substance Use
Major Depressive Disorder (MDD)
MDD is a discrete episode of system-wide shutdown — at least five symptoms, at least two weeks, always including depressed mood or loss of pleasure — that changes how a person eats, sleeps, moves, thinks, and values their own life.
Mental Health & Substance Use
Major Depressive Disorder and Suicide Risk
Keep the person alive first, then fix the brain chemistry and the life problems that fed it.
Mental Health & Substance Use
Nicotine Dependence
Nicotine rewires the brain's reward circuit so that every cigarette feels necessary, not just wanted.
Toxicology / Substance
Opioid Overdose
Opioids turn off the brain's breathing switch, oxygen drops, and the person stops breathing.
Mental Health & Substance Use
Opioid Use Disorder
Medication-assisted treatment (buprenorphine, methadone, or naltrexone) cuts the risk of death in half—50 percent fewer deaths.
Mental Health & Substance Use
Opioid Withdrawal
When someone stops opioids suddenly, their brain's alarm system loses its brake and fires wildly — causing sweating, big pupils, stomach cramps, restlessness, and deep craving — starting 6–12 hours after short-acting drugs or 24–72 hours after long-acting ones like methadone.
Mental Health & Substance Use
Panic Disorder
Panic attacks keep coming back, and the fear of the next one takes over your life.
Clinical Reasoning
Perinatal Mood and Anxiety Disorders
Baby blues is common and fades on its own within two weeks; if sadness or worry lasts longer or gets worse, it is a real mood disorder that needs treatment.
Mental Health & Substance Use
Personality Disorder and Crisis Stabilization
Her moods, sense of self, and relationships swing wildly from moment to moment.
Mental Health & Substance Use
Postpartum Depression
Postpartum depression can start any time during pregnancy or in the first year after giving birth.
Mental Health & Substance Use
PTSD and Trauma Symptoms
Trauma-focused CBT, EMDR, and prolonged exposure are the first-line treatments that work best.
Mental Health & Substance Use
Schizophrenia
Schizophrenia is a brain illness where thoughts, feelings, and what you see get tangled for six months or longer.
Clinical Reasoning
AUB · Abnormal Uterine Bleeding
Abnormal uterine bleeding (periods that are too heavy, too long, too often, or happen at the wrong time) happens when something breaks the normal hormone cycle, a growth forms in the uterus, blood clotting fails, or cancer develops.
Clinical Reasoning
Bartholin Cyst & Abscess
A Bartholin cyst forms when the tiny drainage tube of a lubricating gland at the vaginal opening gets blocked and fluid backs up — and it becomes a painful abscess when bacteria grow inside the trapped fluid.
Clinical Reasoning
Early Pregnancy Loss
A pregnancy that stops growing and ends before 20 weeks, most often because of a chromosome error the embryo could not survive.
Clinical Reasoning
Ectopic Pregnancy
A fertilized egg plants itself and starts growing outside the uterus, usually in the narrow fallopian tube.
Clinical Reasoning
Endometriosis
Tissue that looks and acts like the lining of the uterus grows outside the uterus, bleeds every month with your period, and causes pain, scarring, and trouble getting pregnant.
GYN Emergency
Ovarian Torsion
The ovary twists on its own stalk, kinking its blood vessels and starving itself of oxygen.
Clinical Reasoning
Placenta Previa
The placenta covers the cervix (the exit door for the baby), so when the cervix stretches or opens, the placenta tears and bleeds.
Clinical Reasoning
Placental Abruption
The placenta peels away from the wall of the uterus before the baby is born, cutting off the baby's oxygen and causing dangerous bleeding.
Clinical Reasoning
Postpartum emergency
After a baby is born, four life-threatening emergencies can happen within 6 weeks: postpartum bleeding (hemorrhage) (bleeding >500 mL vaginal or >1000 mL cesarean), endometritis (infection of the uterine lining), preeclampsia with severe features or eclampsia (dangerously high blood pressure ≥160/110 mmHg causing seizures and organ damage), and pulmonary embolism (a clot lodging in a lung artery) (blood clot blocking lung arteries).
Maternity
PPH · Postpartum Hemorrhage
Losing more than 1000 mL of blood after delivery — or any amount that makes the heart race and blood pressure drop — is postpartum bleeding (hemorrhage).
Maternity
Preeclampsia
New high blood pressure after 20 weeks of pregnancy, plus protein spilling into the urine or signs of organ damage.
Toxicology
Acetaminophen Overdose
When you take too much acetaminophen, your liver turns it into NAPQI (a poison), which kills liver cells after the body's protector molecule—glutathione—runs out.
Clinical Reasoning
Acetaminophen poison
When you swallow too much acetaminophen, a poison called NAPQI piles up faster than your liver's shield (glutathione) can grab it. NAPQI sticks to liver cells and kills them.
Critical care
Anaphylaxis
An allergen locks onto IgE antibodies sitting on mast cells all over your body, causing those cells to dump histamine (a chemical that widens blood vessels and makes them leak), leukotrienes (chemicals that squeeze airways shut), and other chemicals all at once—blood vessels widen and leak, blood pressure falls, and airways tighten.
Clinical Reasoning
APAP Toxicity
When you take too much acetaminophen, your liver makes NAPQI (a poison) faster than glutathione (your liver's natural protector) can clean it up, so NAPQI kills liver cells.
Toxicology
Carbon Monoxide Poisoning
Carbon monoxide sticks to hemoglobin 200 times tighter than oxygen does, so your blood cannot deliver oxygen to your cells.
Toxicology
Ccb Overdose
A calcium channel blocker overdose jams the gates that normally let calcium rush into heart muscle, blood vessel muscle, and insulin-making cells, so the heart beats slowly and weakly, blood pressure drops, and blood sugar climbs.
Mental Health & Substance Use
Lithium Toxicity
Lithium's safe window is narrow (0.6–1.2 mEq/L), and anything that drops your body's water or raises sodium—dehydration, diuretics, NSAIDs, kidney trouble—can push lithium into the danger zone fast.
Clinical Reasoning
Opioid emergency
An opioid overdose shuts down breathing and shrinks pupils; naloxone wakes the brain back up and saves lives in minutes.
Toxicology
Salicylate Toxicity
Too much aspirin poisons the tiny power plants inside your cells, makes your breathing race, and floods your blood with acid.
Clinical Reasoning
Toxic Alcohol Poisoning
Methanol and ethylene glycol are not toxic by themselves.
Clinical Reasoning
Tricyclic Antidepressant (TCA) Overdose
Tricyclic antidepressants block sodium channels in the heart, shut off acetylcholine (the body's 'rest and digest' messenger), block alpha receptors on blood vessels, and turn down GABA (the brain's main calming signal).
Mental Health & Substance Use
Valproate Toxicity
Valproate can poison the liver, raise ammonia to dangerous levels, damage the pancreas, and slow the brain—even at normal doses.
Ophthalmology · Emergency
Angle-Closure Glaucoma (Closed-Angle)
The drain inside your eye suddenly slams shut, pressure shoots sky-high in minutes, and the nerve that carries pictures to your brain can die within hours.
ENT · Neurology
BPPV (Benign Paroxysmal Positional Vertigo)
Brief spinning spells triggered by head movement, caused by loose calcium crystals floating in the inner ear's balance canals.
Ophthalmology · Chronic
Cataracts
The clear lens of the eye slowly turns cloudy, making vision hazy and dim.
ENT · Chronic
Ear Cysts (Cholesteatoma and Preauricular Cyst)
An abnormal skin growth or fluid pocket in or near the ear that can erode nearby bone.
Ophthalmology · Emergency
Foreign Body in the Eye
Something small stuck on or in the eye, causing pain, tearing, and a scratchy feeling.
Ophthalmology · Refraction
Hyperopia (Far-Sightedness)
Far things may look clear but near things look blurry because the eye focuses light behind the retina.
Ophthalmology · Refraction
Myopia (Near-Sightedness)
Close things look clear but far things look blurry because the eye focuses light in front of the retina instead of right on it.
Ophthalmology · Chronic
Open-Angle Glaucoma
Slow, painless rise in eye pressure that quietly damages the optic nerve and side vision.
ENT · Infection
Otitis Externa (Swimmer's Ear)
An infection of the outer ear canal, usually caused by bacteria that grow when water stays trapped in the ear, making the skin inside swollen, painful, and tender to the touch.
ENT · Infection
Otitis Media (Middle Ear Infection)
An infection behind the eardrum in the middle ear that fills the space with infected fluid, blocks sound waves, and causes sharp ear pain.
ENT · Neurology
Vertigo (Dizziness and Spinning)
The false feeling that you or the room is spinning, usually from an inner-ear problem.
Vascular Emergency
Acute Limb Ischemia
A clot or traveling clot (embolus) suddenly blocks an artery in the arm or leg, cutting off oxygen to the tissue downstream—like slamming a door on a garden hose.
Clinical Reasoning
Acute Metabolic Acidosis
Blood pH drops below 7.35 because the body either makes too much acid or loses too much bicarbonate—the main buffer that neutralizes acid.
Mental Health & Substance Use
Alcohol Intoxication
Alcohol shuts down the brain in top-to-bottom order: first judgment and coordination fail, then memory blacks out, then consciousness fades, and finally the brainstem stops telling the lungs to breathe.
Clinical Reasoning
Antepartum Triage and Urgent Maternal Warning Signs
Pregnancy reshapes how the body works, so normal changes can look like sickness, and real emergencies can hide behind normal-looking vital signs until the mother suddenly crashes.
Clinical Reasoning
Chorioamnionitis
Bacteria have infected the amniotic sac and the membranes that protect the baby during pregnancy.
Clinical Reasoning
Chronic Hfref
When the heart's squeeze becomes too weak (ejection fraction under 40%), four medicines together—ARNI, beta-blocker, MRA, and SGLT2 inhibitor—block the body's harmful stress response and help the heart last longer.
Clinical Reasoning
CLABSI
Bacteria crawl into the bloodstream through a central line (a large IV tube placed near the heart), causing a blood infection.
Clinical Reasoning
CLABSI Prevention
Following strict sterile steps when placing and caring for central lines prevents bloodstream infections.
Mental Health & Substance Use
Disruptive Mood Dysregulation Disorder (DMDD)
DMDD is a childhood disorder of chronic, severe irritability — the mood between the explosions is the disease, not just the explosions themselves.
Clinical Reasoning
Drowning
Drowning causes the body to run out of oxygen because water blocks the airways or floods the lungs, and that oxygen loss can damage the brain, heart, and lungs within minutes.
Clinical Reasoning
Dyslipidemia
Too much LDL cholesterol in the blood lets fat stick to artery walls and block blood flow to the heart and brain.
Clinical Reasoning
Dysphagia
Trouble moving food or liquid from the mouth, through the throat, and down the esophagus (the swallowing tube) to the stomach.
Clinical Reasoning
Electrical Injury
Electrical injury occurs when current passes through the body, causing burns, heart rhythm problems, muscle damage, and organ injury that is often worse inside than it looks on the skin.
Clinical Reasoning
Epididymitis and Orchitis
Bacteria climb backward from the urethra or bladder into the epididymis (the tightly coiled tube behind each testicle that stores and matures sperm), causing infection and swelling.
Clinical Reasoning
Erectile Dysfunction
The penis cannot get hard enough for sex or stay hard long enough to finish.
Clinical Reasoning
Foreign Body Aspiration
An object is stuck in your airway, blocking the path air normally takes to reach your lungs.
Clinical Reasoning
Frailty
Frailty looks like slow walking, weak grip, unplanned weight loss, exhaustion, and low activity — a body running on empty reserves.
Hematology
G6PD Deficiency
G6PD deficiency means red blood cells cannot protect themselves from oxidative stress, so they suddenly burst when exposed to certain triggers like fava beans, infections, or specific medications.
Clinical Reasoning
Gad
You worry too much about everyday things, nearly every day, for at least 6 months, and you cannot turn it off.
Clinical Reasoning
Hashimoto thyroiditis
Your own immune system slowly destroys your thyroid gland, so the gland makes less and less thyroid hormone over time.
Clinical Reasoning
Heat Illness and Hypothermia
When body temperature climbs above 40°C (104°F), the brain and organs start to cook and fail; when it drops below 35°C (95°F), the heart slows dangerously and blood chemistry falls apart.
Clinical Reasoning
HELLP Syndrome
In HELLP, the lining of blood vessels gets damaged, red blood cells break apart, the liver swells and leaks enzymes, and platelets drop — all from the same upstream break in pregnancy.
Clinical Reasoning
Hfpef
The heart squeezes fine but cannot relax and fill with blood the way it should.
Clinical Reasoning
Hyperemesis Gravidarum
The mom throws up so much during pregnancy that she loses weight and her body chemistry goes haywire.
Clinical Reasoning
Hypothermia
The body's core temperature drops below 35°C (95°F), and the machinery that makes and keeps heat cannot keep up.
Clinical Reasoning
Ileus
The bowel's muscle waves stop — food, gas, and fluid pile up inside, even though there is no blockage.
Clinical Reasoning
Increased Icp and Herniation
When the brain swells or a mass grows inside the hard skull, pressure climbs and squeezes the brainstem—the part that keeps you breathing and awake.
Mental Health & Substance Use
Insomnia
CBT-I (a short talk therapy that retrains your sleep habits) is the best first choice and keeps working long after you finish it.
Mental Health & Substance Use
Involuntary Evaluation Capacity and Medical Clearance
Capacity means you can understand the facts, see how they apply to you, reason through your options, and tell someone your choice.
Clinical Reasoning
Lactation and Medication Safety
Most medicines are safe while breastfeeding — only a tiny bit gets into milk.
Clinical Reasoning
Low testosterone
Low testosterone means the testis itself is not making enough hormone, or the brain signals that tell it to make testosterone are turned off.
Clinical Reasoning
Male Infertility
A couple cannot get pregnant after one year of trying, and the problem is on the man's side.
Clinical Reasoning
Malnutrition
The body is not getting enough fuel from food, so it starts eating itself to survive.
Clinical Reasoning
Men's Sexual Health
How a man's body works for sex, strength, and energy — the parts (penis, testes, prostate), the hormones like testosterone (the main male hormone that builds muscle, drives sex drive, and powers erections), what can go wrong (low testosterone that drains energy and desire, erectile dysfunction where the penis won't stay hard, infections in the urethra or prostate, and prostate problems that block urine flow), and how to keep everything running strong — explained straight, simple, and backed by medical evidence from the American Urological Association, Endocrine Society, and CDC so you understand what's normal, what breaks, and how to fix it.
Toxicology / Hematology
Methemoglobinemia
An oxidizing poison flips the iron inside hemoglobin from the good form (Fe²⁺) that grabs oxygen to a bad form (Fe³⁺) that cannot, so the blood turns chocolate brown and the body turns blue even though the lungs work fine.
Clinical Reasoning
Mis C
A post-COVID immune storm in kids that attacks the blood vessels and heart, usually 2–6 weeks after the infection clears.
Clinical Reasoning
Mitral Regurgitation
Each heartbeat sends some blood backward into the left atrium instead of forward into the body.
Clinical Reasoning
Mitral Stenosis
The mitral valve is too narrow, so blood backs up into the lungs.
Clinical Reasoning
Necrotizing Soft Tissue Infection
Bacteria eat through the tissue layer under the skin so fast that without emergency surgery most people die.
Clinical Reasoning
Neonatal Respiratory Distress
A newborn who breathes fast, pulls in the chest with each breath, grunts, or turns blue is showing that the lungs are not opening or swapping oxygen the way they should.
Clinical Reasoning
Newborn jaundice
All newborns have some yellow color in their skin from bilirubin, because their liver is still learning its job and red blood cells are breaking down faster than before birth.
Clinical Reasoning
Noninvasive Versus Invasive Ventilation
NIV (a mask that pushes air in gently) helps awake patients whose lungs can still heal — like someone with a COPD flare-up or fluid in the lungs from heart failure — while invasive ventilation (a breathing tube down the throat) is for patients who cannot protect their airway, are too tired to breathe, or whose lungs are so sick they need full control.
Mental Health & Substance Use
Obsessive-Compulsive Disorder
Unwanted, scary thoughts pop up over and over, and the person does the same behavior again and again to calm the fear — together these take at least an hour every day.
Clinical Reasoning
Pcos
The ovaries make too much male hormone, eggs do not release each month, and many small cysts sit on the ovaries.
Clinical Reasoning
Peripheral Arterial Disease and Acute Limb Ischemia
Chronic PAD means stop smoking now, walk 30–45 minutes three times a week with a trainer, take a daily antiplatelet pill (aspirin or clopidogrel) and a statin, and fix severe blockages with a balloon-and-stent or bypass if rest pain or dead tissue shows up. ALI is a sudden clot that plugs the artery in minutes; fix blood flow within 6 hours or the leg dies.
Clinical Reasoning
Polypharmacy and Deprescribing
Five or more medicines at once raise the risk of dangerous drug interactions, side effects, and falls—especially in older adults.
Mental Health & Substance Use
Post-Traumatic Stress Disorder
After a terrifying event: unwanted memories that feel real, avoiding anything that reminds you of it, dark moods, and being on high alert for more than a month.
Clinical Reasoning
Postoperative Hemorrhage
A blood vessel starts leaking after surgery, red blood cells spill out faster than the body can replace them, and blood pressure drops because there is not enough fluid left in the pipes.
Clinical Reasoning
Postoperative Ileus
In Postoperative A stalled gut (Ileus), the bedside team that sees the cluster early — vitals plus exam plus one targeted study — outperforms the team that waits for a broad panel.
Clinical Reasoning
PPROM · Pprom
The bag of water breaks before 37 weeks and before labor starts.
Clinical Reasoning
Preterm Labor
The uterus starts squeezing and the cervix begins to open before 37 weeks — the goal is to buy more time for the baby to grow.
Clinical Reasoning
Respiratory acidosis
The lungs cannot blow off enough carbon dioxide, so it piles up in the blood and makes the body too acidic.
Clinical Reasoning
Rhabdomyolysis
Muscle cells have broken open and are dumping their insides — myoglobin (the oxygen-carrying protein in muscle), potassium, phosphate, and creatine kinase (CK, an enzyme) — into the bloodstream.
Clinical Reasoning
Sbo
Something is blocking the small bowel, so nothing can squeeze past it.
Mental Health & Substance Use
Serotonin Syndrome
Taking two drugs that both raise serotonin (like an SSRI plus an MAOI, linezolid, tramadol, methylene blue, or MDMA) floods the brain with too much serotonin and poisons the nervous system.
Clinical Reasoning
Shoulder Dystocia
Birth emergency — baby's head comes out, but the front shoulder gets stuck behind the mother's pubic bone.
Clinical Reasoning
SJS/TEN
A life-threatening skin reaction where the body's own immune cells attack and kill skin cells, usually triggered by a medicine, causing the skin and the moist linings of the body to blister, peel off in sheets, and leave raw, weeping wounds.
Clinical Reasoning
Skin damage
Pressure squashes tiny blood tubes in the skin, so oxygen stops reaching the spot and the skin dies.
Clinical Reasoning
Subarachnoid Hemorrhage
Blood bursts into the cushion space around the brain, causing the worst headache of your life.
Clinical Reasoning
Sudden confusion
Sudden confusion means the brain's thinking surface (the cerebral cortex) or its deep wake-up switch (the reticular activating system in the brainstem) just lost oxygen, fuel, or normal chemistry—find the cause and fix it in minutes, because the clock is ticking.
Clinical Reasoning
Surgical Site Infection
A surgical site infection is an infection that starts in the cut made during surgery, appearing within 30 days of the operation—or up to 1 year later if an implant (like a mesh, screw, or artificial joint) was placed.
Clinical Reasoning
T2dm
The body's cells stop listening to insulin, so sugar piles up in the blood and damages organs over time.
Clinical Reasoning
Transfusion Reactions
The bag is guilty until proven innocent.
Clinical Reasoning
Transplant infection
Transplant drugs that block rejection also block the body's germ fighters, so infections come in waves based on time since surgery.
Clinical Reasoning
Trauma and Hemorrhage
Trauma breaks blood vessels and organs; bleeding (hemorrhage) (uncontrolled bleeding) drains the body's blood supply and causes shock (not enough blood pressure to feed vital organs).
Clinical Reasoning
VAP and HAP Prevention and Management
Hospital-acquired pneumonia is a new lung infection that starts at least 48 hours after being admitted to the hospital; ventilator-associated pneumonia is the same infection but happens after being on a breathing machine for at least 48 hours.
Hematology
Von Willebrand Disease
Von Willebrand disease is a failure of the glue that helps platelets stick to injured blood vessels, making bleeding last longer than it should.
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Adapted with permission from the Clinical Reasoning Loop™, part of the Think Like a Provider™ Clinical Reasoning System by Jennawè Whitley, APRN, FNP-BC, NP-C. © Capital Covenant Enterprise LLC.
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