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Gas
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Symptoms

Gas

Gas is a common digestive occurrence caused by swallowed air and the breakdown of food, typically manageable through lifestyle adjustments.

Overview

Everyone has gas. Most people pass gas 13 to 21 times a day. Passing gas through the mouth is called belching or burping. Passing gas through the anus is called flatulence. Most of the time gas does not have an odor. The odor comes from bacteria in the large intestine that release small amounts of gases that contain sulfur.

Causes

Gas in the digestive tract comes from two sources: air that you swallow and the breakdown of undigested food by bacteria in the large intestine. Certain foods may cause gas, though foods that produce gas in one person may not cause gas in another.

Management

You can reduce the amount of gas you have by:

  • Drinking lots of water and non-fizzy drinks
  • Eating more slowly so you swallow less air when you eat
  • Avoiding milk products if you have lactose intolerance

Medicines can help reduce gas or the pain and bloating caused by gas. If your symptoms still bother you, see your health care provider.

Frequently Asked Questions

Common culprits include beans, lentils, broccoli, cabbage, onions, whole grains, and carbonated drinks. Try reducing portion sizes, cooking beans thoroughly, using a slow cooker, or gradually increasing fiber intake to allow your gut to adjust. How can I reduce bloating and discomfort after meals?::Eat slowly, chew food thoroughly, avoid chewing gum or drinking through a straw, stay upright for at least 30 minutes after eating, and consider taking a probiotic supplement to support gut flora balance. When should I see a doctor for persistent gas or flatulence?::If you notice sudden, severe abdominal pain, weight loss, blood in stool, persistent vomiting, or if gas is accompanied by diarrhea or constipation, consult a healthcare professional, as these could signal conditions like irritable bowel syndrome, celiac disease, or inflammatory bowel disease. What medications can help with gas and how do they work?::Simethicone reduces surface tension of gas bubbles, allowing them to coalesce and be expelled more easily. Activated charcoal can absorb excess gas but may interfere with drug absorption. Antispasmodics relax intestinal muscles, easing bloating. Always discuss with a pharmacist or doctor before starting any new medication.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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