What causes Abdominal bloating?
Last updated September 7, 2026.
Most abdominal bloating comes from gas and pressure building up in your digestive tract, usually from swallowed air, foods your gut ferments, constipation, or a food intolerance. What is driving it changes the fix. Fizzy drinks, chewing gum, eating fast, and smoking push extra air in, while beans, onions, wheat, dairy, and sugar alcohols like sorbitol feed gas-producing bacteria. Constipation is one of the most common causes, since stool sitting in the colon leaves gas nowhere to go. Irritable bowel syndrome, lactose intolerance, celiac disease, and hormonal shifts around your period also produce a bloated, distended feeling. Eating slowly, drinking more water, building fiber up gradually, and walking after meals help many people within a few weeks.
What to do
- Treat constipation first: If you are having fewer than three bowel movements a week or straining, fixing that often resolves the bloating on its own.
- Slow your eating: Take smaller bites, skip gum and straws, and avoid carbonated drinks so you swallow less air.
- Test one food at a time: Drop dairy, or sugar alcohols, or carbonated drinks for two weeks and watch what changes instead of cutting everything at once.
- Add fiber gradually: Increase fiber over several weeks with plenty of water, since a sudden jump makes gas worse before it gets better.
- Move after meals: A 10 to 15 minute walk helps gas move through and eases the pressure feeling.
- Know the red flags: See a clinician for bloating lasting three weeks or more, or with weight loss, vomiting, blood in stool, fever, or trouble swallowing.
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