Gas and bloating

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IBS
Bloating and a swelling belly often come with irritable bowel syndrome and are often treated as the same thing. But Rome IV classes bloating-dominant cases separately as functional bloating or distension, with more than one cause (food intolerance, microbes changed after an infection, amplified gut sensation, a misfiring abdominal-diaphragm reflex).
Probiotics
Bloating is one of the most common reasons people buy probiotics, but the American Gastroenterological Association's 2023 expert review advises explicitly that probiotics should not be used to treat bloating and abdominal distension; for lactose intolerance, a systematic review likewise found the evidence for probiotics insufficient.

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Feeling bloated is not more gas

THE SHORT ANSWER

Feeling bloated and a belly that actually swells are two different things; people who always feel bloated often have no more gas than others, they just tolerate it less well.

WHAT IT MEANS FOR YOU

Blood in the stool, unexplained weight loss, anemia, or a newly growing belly in a woman over 40: see a doctor first. Black stools or vomiting blood: the emergency department the same day.
If you suddenly cannot pass any gas or stool, with severe belly pain and vomiting, go to the emergency department now.

EVIDENCEGUIDE 4 · REVIEW 1 · COHORT 1 · MECH 1

READ THE ORIGINAL

Bloating is really two things. One is the feeling: gas trapped inside, tightness, fullness. The other is the belly actually swelling, a waist you can measure getting bigger. They often come together but can occur alone, and they often accompany irritable bowel syndrome, functional dyspepsia and constipation.

The most counterintuitive part: people who always feel bloated and gassy often do not have more gas in their gut than anyone else. In one study, people complaining of gas passed it about 3 times as often in the daytime as healthy people, yet released almost the same volume after the same meal. What differed was that they tolerated the gas in their gut less well.

See a doctor first if you have blood in your stool, unexplained weight loss or anemia, or if you are a woman over 40 whose belly has newly grown larger. Black stools or vomiting blood: go to the emergency department the same day. If you suddenly cannot pass any gas or stool, with severe belly pain and vomiting, go to the emergency department now.

Educational content, not medical advice — consult a clinician.

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