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Gas (Flatus) - Topic Overview
SYMPTOMS & TREATMENTS
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.
Gas that forms after eating meat and eggs tends to smell bad, while gas derived from fruits and vegetables usually does not have an odor.
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.
- 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.
| By: | Healthwise Staff | Last Revised: May 28, 2010 |
| Medical Review: | H. Michael O'Connor, MD - Emergency Medicine Adam Husney, MD - Family Medicine | |
© 1995-2011 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.
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