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Why does gas build up in IBS?

Gas in IBS is partly about volume and largely about sensitivity — and both respond to how you eat, not only to what you eat.

03 Aug 2026 1 min read

Everyone produces gas. In IBS two things change: fermentation patterns can shift, and the gut becomes more sensitive, so an ordinary volume of gas registers as pain or distension.

What adds to the volume

Air swallowed while eating quickly or talking through a meal, aerated drinks, long gaps followed by large meals, and low physical activity all increase gas. None of these are about a single "bad food".

What raises the sensitivity

Stress, poor sleep and abdominal tension all lower the threshold at which the gut reports discomfort. This is why the same lunch can be fine on a calm Tuesday and unbearable on a difficult Thursday.

Practical steps

Eat slowly and chew properly. Keep portions moderate and intervals regular. Walk for ten minutes after meals instead of lying down. Practise gentle breathing to release abdominal tension. Then, and only then, look for specific food triggers — you will identify them far more accurately once the basics are steady.

This website is intended for general health education and wellness information. The information given here is not a substitute for individual medical diagnosis or emergency medical treatment. For any serious, new or persistent symptom, please consult a qualified healthcare professional.