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Gas (Flatus) - Topic Overview

What is gas?

Gas (flatus) is made in the stomach and intestines as your body breaks down food into energy. All people pass gas, some people more than others. It is normal to pass gas from 6 to 20 times per day.

What causes gas?

Common causes of gas include:

  • Swallowed air. If swallowed air is not burped up, it passes through the digestive tract and is released through the anus as flatus. Excessive air swallowing may cause hiccups.
  • Foods and beverages. The amount of gas that different foods cause varies from person to person. And the foods that produce gas with odor may be different for every person too.
  • Constipation. This can cause bloating but generally does not increase gas.
  • Medicines or nutritional supplements. Both prescription and nonprescription medicines, as well as dietary supplements, can cause bloating and gas as side effects.
  • A medical condition, such as a bowel obstruction or Crohn's disease.
  • Changes in hormone levels. It is common for women to have bloating right before their periods because their bodies retain fluid.

Can I treat or prevent gas?

You may be able to prevent gas by changing your eating and drinking habits. Occasionally gas is a symptom of a medical condition that requires treatment.

Examples of gas-producing foods are:

  • Vegetables such as artichokes, asparagus, broccoli, brussels sprouts, cabbage, cauliflower, cucumbers, green peppers, onions, peas, radishes, and raw potatoes.
  • Beans and other legumes.
  • Fruits such as apricots, bananas, melons, peaches, pears, prunes, and raw apples.
  • Wheat and wheat bran.
  • Eggs.
  • Carbonated drinks, fruit drinks, beer, and red wine.
  • Fried and fatty foods.
  • Sugar and sugar substitutes.
  • Milk and other dairy products, especially in people who have trouble digesting lactose, the main sugar found in milk.
  • Packaged foods that contain lactose, such as breads, cereal, and salad dressing.

Dietary supplements such as Beano may help to prevent gas.

Some people get relief from gas from products containing simethicone, a medicine that dissolves gas bubbles. Nonprescription medicines with simethicone include Gas-X and Mylicon.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: July 05, 2013
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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