Definition & Facts for Gas in the Digestive Tract

What is gas?

A gas is a substance that has no fixed size or shape. When inside a closed container, a gas will expand to fill the container. An example of gas is the air you breathe.

The gas inside your digestive tract is made of air and other gases. Gas typically leaves your digestive tract through your mouth when you belch—or burp—or through your anus when you pass gas. Having gas and some gas symptoms is normal. Many people are bothered by gas symptoms once in a while.

However, some people have repeated gas symptoms that bother them often or affect their daily activities. People may have problems with gas symptoms because they

• have excess gas in the digestive tract
• feel more severe gas symptoms, even when a normal amount of gas is in the digestive tract

How common is gas?

Everyone has gas in the digestive tract, and many people have problems with gas symptoms. For example, research suggests that 16% to 31% of people experience bloating—a feeling of swelling or fullness in the abdomen.1 In a large U.S. survey, about 20% of participants said they experienced bloating in the past week.2

Who is more likely to have problems with gas symptoms?

Some people are more likely to have problems with gas symptoms if they have certain health conditions. People who swallow more air or eat more of certain foods may also have more gas symptoms.

References

[1] Lacy BE, Cangemi D, Vazquez-Roque M. Management of chronic abdominal distension and bloating. Clinical Gastroenterology and Hepatology. 2021;19(2):219–231.e1. doi: 10.1016/j.cgh.2020.03.056

[2] Almario CV, Ballal ML, Chey WD, Nordstrom C, Khanna D, Spiegel BMR. Burden of gastrointestinal symptoms in the United States: results of a nationally representative survey of over 71,000 Americans. American Journal of Gastroenterology. 2018;113(11):1701–1710. doi: 10.1038/s41395-018-0256-8

Where this page came from

This page was imported from National Institute of Diabetes and Digestive and Kidney Diseases. Published by the National Institute of Diabetes and Digestive and Kidney Diseases (NIH) and, as a work of the United States government, in the public domain; its pictures are not copied (many are licensed stock).

Nobody has written it yet — it is the source material at a new address, which is why search engines are asked to skip it and why no one earns from it. It is up for grabs: take it on, and it is yours to rewrite and to earn from.