Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Adult ADHD

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In one line

·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.

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Normal physiology

·Normally, the prefrontal cortex (the brain's executive control center at the front of the skull) uses dopamine and norepinephrine to filter out unimportant sights and sounds, hold information in working memory (your mental scratch pad for seconds to minutes), delay impulses until you decide whether to act, put tasks in the right order, and sense how much time is passing.

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What goes wrong

·In ADHD, the prefrontal cortex cannot hold or use dopamine and norepinephrine well enough, so the attention filter, the impulse brake, working memory, time sense, and emotional control all fail at the same time—in every part of life.

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Hallmark signs

·Trouble staying focused on tasks, easily pulled away by sounds or thoughts, often makes careless mistakes
·Forgets where things are, misses appointments, loses track of instructions even when trying hard to remember
·Acts or speaks without thinking: interrupts others, makes snap decisions, jumps into things without weighing the risks
·Restlessness or fidgeting: taps feet, shifts in the chair, feels an inner motor running all the time
·Messy space, jumping between tasks without finishing, trouble deciding what to do first
·Always late, guesses wrong how long things take, misses deadlines despite wanting to be on time
·Gets frustrated or annoyed quickly, snaps easily, takes a long time to calm down after getting upset
·Locks onto interesting activities so deeply that hours vanish—skips meals, loses sleep, ignores other responsibilities

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Red flags · escalate now

·Attention trouble that starts for the first time after age 12 with no childhood signs—think thyroid disease (the thyroid gland in the neck controls how fast the body burns energy), sleep pauses in breathing (apnea) (breathing stops many times during sleep and starves the brain of oxygen), medication side effects, or drug use instead.
·Thoughts of suicide or deep sadness that does not lift—ADHD raises the chance of depression and acting on impulse without thinking through the outcome; check mood right away and get help urgently.
·Taking more stimulant medicine than prescribed, using someone else's pills, or mixing the medicine with alcohol or other drugs—this signals addiction risk and needs immediate help and close monitoring.
·Losing jobs over and over, getting arrested for impulsive choices, or racking up serious debt from snap decisions—the person needs close support, case management, and monitoring to prevent bigger harm.
·Active drug or alcohol problem right now—stimulant ADHD medicines (like amphetamine or methylphenidate) can make cravings worse, raise blood pressure dangerously, or trigger relapse; treat the addiction first or switch to a non-stimulant ADHD medicine like atomoxetine or bupropion.

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Workup

·Thyroid-stimulating hormone (TSH)
·Complete blood count (CBC)
·Basic metabolic panel (BMP)
·Urine drug screen
·Electrocardiogram (ECG)
·Baseline heart rate and blood pressure
·Sleep study (polysomnography) if the patient snores loudly, has witnessed pauses in breathing at night, or feels exhausted despite sleeping
·Structured psychiatric interview (MINI or SCID) to screen for major depressive disorder, generalized anxiety disorder, bipolar disorder, or psychosis

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Treatment

·ASRS-v1.1 screener plus collateral history from family, partner, or employer
·Stimulant medication—methylphenidate (brand names Ritalin, Concerta) or amphetamine (brand names Adderall, Vyvanse)—started low and titrated (gradually increased) every 3–7 days until symptoms improve
·Behavioral coaching and external structure—daily planners, smartphone reminders and alarms, time-blocking (assigning specific tasks to specific time slots), checklists, designated spots for keys and wallet
·Sleep hygiene—same bedtime and wake time every day (even weekends), dark bedroom, temperature 65–68°F, no screens for 1 hour before bed, no caffeine after 2 PM
·Screen and treat comorbid major depressive disorder or generalized anxiety disorder with SSRIs (selective serotonin reuptake inhibitors like sertraline, escitalopram), SNRIs (serotonin-norepinephrine reuptake inhibitors like duloxetine, venlafaxine), or cognitive-behavioral therapy (CBT, a type of talk therapy that rewires thought patterns and behaviors)
·Atomoxetine (a selective norepinephrine reuptake inhibitor, brand name Strattera) or guanfacine (an alpha-2 adrenergic agonist that activates calming receptors in the prefrontal cortex, brand name Intuniv) if stimulants fail, cause intolerable side effects, or are unsafe
·Address social determinants of health—stable housing, reliable food, physical safety, and adequate sleep. Refer to social work, case management, or community resources as needed

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NCLEX trap

·Adult ADHD symptoms look a lot like anxiety, depression, bipolar disorder, drug use, sleep pauses in breathing (apnea), and thyroid disease. Before you start a stimulant — a medicine that speeds up the heart and raises blood pressure by pushing norepinephrine (a brain messenger that also tightens blood vessel walls) onto receptors — you must get a heart history, a 12-lead ECG (a test that records the heart's electrical signals to show rhythm and damage), a blood pressure reading, and a drug screen, especially for cocaine or methamphetamine, which flood the brain with dopamine (the brain's main focus and reward messenger) and norepinephrine and can cause deadly heart rhythms when mixed with stimulants. Confirm that the person had trouble focusing and controlling impulses before age 12 and that the problems show up in at least two places — work, home, social life. Starting stimulants without safety checks can trigger a heart attack (heart muscle dies when its blood supply is blocked), stroke (brain tissue dies when blood flow stops or a vessel bursts), or a dangerous heart rhythm in someone with hidden heart disease, high blood pressure, or a heart defect they were born with.
·Adult ADHD diagnosis requires collateral history — information from family, friends, or coworkers who see the person in different settings — to confirm that symptoms appear in at least two environments, such as work and home or school and social, and cause real, measurable harm such as job loss, broken relationships, accidents, or money problems. Trusting self-report alone can miss other diagnoses — depression, anxiety, not enough sleep — or lead to overdiagnosis in people who want stimulants to boost performance or to sell. One person's complaint is not enough to meet DSM-5 criteria, the official checklist doctors use to diagnose mental health conditions.
·When basic survival needs are unmet — homelessness, not enough food, chronic sleep under 6 hours per night, active alcohol or drug use — the prefrontal cortex (the front part of the brain that uses dopamine and norepinephrine to focus and pump the brakes on impulses) cannot respond normally to medicine. Chronic stress raises cortisol (the body's main stress hormone, which damages nerve connections in the prefrontal cortex when it stays high), and not eating enough or sleeping too little drains the building blocks and energy the brain needs to make dopamine and norepinephrine. Stabilize housing, food, and sleep — goal 7 to 9 hours every night — and treat substance use disorder with medication-assisted treatment, for example buprenorphine for opioid use or naltrexone for alcohol use, before or at the same time as starting ADHD medicine, or the medicine will not work well.
·Many people lose items now and then or daydream without having a disorder. Adult ADHD diagnosis under DSM-5 requires that inattention, hyperactivity, or impulsivity cause clinically significant impairment — major problems — in at least two life areas, such as job loss or demotion, car accidents, relationship failure, money crisis, or legal trouble. Symptoms must be persistent, meaning present for at least 6 months; pervasive, meaning they occur across settings, not just at work or just at home; and not better explained by another condition such as depression, anxiety, sleep pauses in breathing (apnea), or substance use. If there is no real harm, there is no disorder to treat.
·Up to half of adults with ADHD also have major depression, generalized anxiety disorder, substance use disorder, or obstructive sleep pauses in breathing (apnea) — a condition in which the airway collapses during sleep, causing oxygen drops and broken sleep that wreck daytime attention. These conditions also lower dopamine and norepinephrine or stop the prefrontal cortex from using them well. Treat all conditions at the same time: for example, start an SSRI such as sertraline — a medicine that raises serotonin (a brain messenger that steadies mood and sleep) in the synapses — for depression, refer for CPAP (a machine that blows air into the nose to hold the airway open during sleep) for sleep pauses in breathing, or offer naltrexone or disulfiram for alcohol use disorder while starting ADHD medicine. Treating only one disorder leaves the others active and blocks full recovery.

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