Compare conditions

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

Appendicitis

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In one line

·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.

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Normal physiology

·The appendix is a narrow, worm-shaped pouch three to four inches long that hangs off the cecum (the first part of the large intestine) in the lower right belly. Its wall holds immune cells like tonsils do, but it has no proven essential job in adults. The inside of the appendix is a hollow tube that opens into the cecum, and mucus normally drains from the appendix into the colon. Keep that picture in your head—a dead-end tube with one small opening—because every sign of appendicitis flows from what happens when that opening gets blocked.

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What goes wrong

·One event—blockage of the appendix opening—triggers every downstream finding.

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Hallmark signs

·Belly-button pain that moves to the lower-right side
·No appetite (you don't want to eat at all)
·Feeling sick to your stomach and throwing up
·Low fever (100–101°F at first; higher if the appendix bursts)
·Tenderness at McBurney's point (lower-right belly, about one-third the way from your hip bone to your belly button)
·Your belly muscles tighten up on their own when touched (guarding), or your whole belly feels rock-hard (rigidity)
·Rebound tenderness (pain when the doctor presses slowly and then lets go suddenly — called Blumberg's sign)
·Rovsing's sign (you feel pain in your lower-right belly when the doctor presses your lower-left side)

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Red flags · escalate now

·Board-hard belly everywhere (diffuse rigidity) — the appendix has burst and bacteria are spreading through your whole abdomen (diffuse peritonitis — infection all over the belly lining); you need emergency surgery right now.
·Fever above 102°F plus a racing heart (over 120 beats per minute) or low blood pressure (top number under 90) — your body is losing the fight against infection (sepsis — a whole-body response to infection that can shut down organs); you need IV fluids, powerful antibiotics, and close monitoring in the hospital, possibly the ICU.
·Your pain suddenly gets better for a few minutes, then comes roaring back worse and spreads everywhere — classic sign the appendix just popped; when it bursts, pressure drops and pain eases briefly, then bacteria flood your belly and pain explodes.
·Confusion, extreme sleepiness, or not making sense — your brain isn't getting enough oxygen or your blood is poisoned by infection (septic shock — dangerously low blood pressure from infection); life-threatening without immediate treatment.
·Pregnant beyond the first three months with right-sided or unusual belly pain — the growing uterus pushes the appendix upward and hides the usual signs; a burst appendix is more dangerous for both mom and baby, so any belly pain in pregnancy needs urgent evaluation.

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Workup

·Complete blood count (CBC) with differential
·C-reactive protein (CRP)
·CT scan of the abdomen and pelvis with intravenous (IV) contrast
·Ultrasound of the right lower belly
·Urinalysis
·Pregnancy test (beta-hCG) in all females who could be pregnant
·Basic metabolic panel (BMP)
·Alvarado score or Pediatric Appendicitis Score (PAS) clinical decision tool

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Treatment

·Make the patient NPO (nothing by mouth) and start IV fluids with normal saline or lactated Ringer's solution
·Give IV antibiotics that cover gram-negative rods and anaerobic bacteria—such as ceftriaxone (a cephalosporin) plus metronidazole, or piperacillin-tazobactam alone—per Infectious Diseases Society of America (IDSA) 2010 and Surgical Infection Society 2010 guidelines
·Perform appendectomy (surgical removal of the appendix) within 12 to 24 hours, preferably by laparoscopy (using a camera and small cuts), per American College of Surgeons 2020 guidelines
·Give pain medicine (such as IV acetaminophen, ketorolac, or opioids like morphine or fentanyl) and anti-nausea medicine (such as ondansetron, a serotonin blocker)
·If the appendix has burst and formed a walled-off abscess (pocket of pus surrounded by a thick capsule), place a drain through the skin (percutaneous drainage) guided by ultrasound or CT, give antibiotics for seven to ten days, and remove the appendix six to ten weeks later (interval appendectomy)—per American College of Surgeons 2020 guidelines for complicated appendicitis

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NCLEX trap

·Classic appendicitis begins with pain around the belly button (caused by the swollen appendix stretching inside, which sends fuzzy signals through nerves that connect to the spinal cord near the belly button). Over several hours, the pain moves to the lower right side of the abdomen as the lining of the belly wall itself gets irritated (that lining has very exact nerves, so the pain becomes sharp and pinpoint). Pain starting near the belly button is actually a hallmark sign of appendicitis, not a reason to rule it out.
·Most patients with appendicitis have a high white blood cell count (above 11,000 cells per microliter, showing the body is fighting infection), but 10 to 20 out of every 100 patients have a normal count, especially early on or in older adults. Never rely on one lab number alone to diagnose or rule out appendicitis. Always look at the whole story: what the patient tells you, what you find on exam, and what imaging shows.
·Imaging is helpful but not perfect. Sometimes the appendix is not seen on ultrasound or CT, or it looks normal even when it is inflamed, especially early. If the patient's story and exam strongly suggest appendicitis (pain that moved from the belly button to the lower right, tenderness when you press there, fever, loss of appetite, nausea), trust the clinical picture over imaging alone. In these cases, repeat exams over time or surgical consultation may be needed.
·Appendicitis is urgent and needs timely treatment, but rupture (the appendix bursting open and spilling infected contents into the belly) typically happens 24 to 72 hours after symptoms start, not within minutes or hours. In some cases of uncomplicated appendicitis (no hard stool blockage inside, no pocket of pus), antibiotics alone may work, though the appendicitis comes back in about 30 to 40 out of every 100 patients within 1 to 5 years. The goal is prompt treatment without unnecessary panic.
·Older adults and pregnant patients often have milder or different symptoms. Pain may be less focused, fever may be low or absent, and belly tenderness may be subtle. These groups have higher rates of rupture and life-threatening bloodstream infection at presentation because the diagnosis is delayed. Always keep a high suspicion for appendicitis in these patients, even when classic signs are missing.
·Some patients with early appendicitis can tolerate food at first. Loss of appetite, nausea, and vomiting usually develop gradually as inflammation grows over hours. Never use a single finding to rule appendicitis in or out. Look at the full clinical picture: pain pattern, exam findings, labs, and imaging together.

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