Why does Abdominal bloating happen?
Last updated September 7, 2026.
Bloating happens when gas, fluid, or stool builds up inside your digestive tract, or when your gut becomes more sensitive to normal amounts of it. Most gas comes from two places: air you swallow while eating, drinking, or chewing gum, and gas made by bacteria fermenting carbohydrates in your colon. Constipation makes it worse because gas has less room to move past backed-up stool. Ongoing bloating is often tied to irritable bowel syndrome, lactose or fructose intolerance, celiac disease, or hormone shifts around your period. Eating more slowly, cutting back on carbonated drinks, adding fiber and water gradually, and walking after meals help many people within a couple of weeks.
What to do
- Slow your eating: Eat sitting down over at least 20 minutes and skip gum, straws, and carbonated drinks, which all push extra air into your stomach.
- Track the trigger: Write down meals and symptoms for two weeks so you can see whether dairy, wheat, beans, or sugar-free products containing sorbitol line up with your worst days.
- Test dairy properly: If you suspect lactose, drop it fully for two weeks, then add it back once; a real intolerance shows up clearly on the day you reintroduce it.
- Treat constipation first: Increase fiber and fluids slowly over a few weeks and stay active, since fast fiber jumps often make bloating worse before they help.
- Get celiac testing before cutting gluten: Blood tests only work while you are still eating wheat, so ask your clinician about testing first if gluten seems to be a trigger.
- Know the checkpoints: Bloating with unplanned weight loss, rectal bleeding, persistent vomiting, or new symptoms after age 50 needs an in-person evaluation.
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