Why does Abdominal pain - children under age 12 happen?
Last updated September 7, 2026.
**Most belly pain in children under 12 comes from common, short-lived causes such as constipation, a stomach virus, trapped gas, or eating too much, and it settles within a day or two.** What changes the answer is where the pain sits, how long it lasts, and how your child looks between episodes. Pain around the navel that comes and goes while your child still plays, drinks, and sleeps is usually harmless, while pain that stays in one spot and steadily worsens is more concerning. Constipation is the single most common cause at this age, and many children have hard or infrequent stools without saying so. Infections outside the gut, including urinary tract infections and strep throat, can also show up as stomach pain. Keeping a simple log of meals, bowel movements, and when the pain hits often reveals the pattern faster than any test.
What to do
- Check the bowels first: Ask when your child last passed stool and whether it was hard or painful, since constipation explains a large share of belly pain at this age.
- Watch how they move: A child who runs, jumps, and climbs into the car normally is far less likely to have a surgical problem than one who curls up and resists being touched.
- Keep fluids going: Offer small, frequent sips of water or an oral rehydration solution during vomiting or diarrhea rather than large drinks that come back up.
- Skip the guesswork on medicine: Do not give ibuprofen, laxatives, or anti-nausea products to a child with unexplained belly pain without asking a clinician first.
- Track the pattern: Note the time, location, and length of each episode plus what your child ate, and bring that list to any visit.
- Go in the same day for red flags: Pain fixed in the lower right side, blood in stool or vomit, green vomit, a hard swollen belly, or pain that wakes your child from sleep needs prompt in-person care.
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