Intestinal gas

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Definition

Intestinal gas, or air in the digestive tract, is usually not noticed until we burp or pass it rectally (flatulence). The entire digestive tract, from the stomach to the rectum, contains intestinal gas as the natural consequence of swallowing and digestion.

In fact, certain foods, such as beans, are not fully broken down until they reach the large intestine (colon), where bacteria act on (ferment) them.

Excessive intestinal gas sometimes indicates a digestive disorder, but everyone passes gas several times daily, and occasional burping or belching is normal.

Causes

Excess upper intestinal gas can result from swallowing more than a usual amount of air, overeating, smoking or chewing gum. Excess lower intestinal gas can be caused by eating too much of certain foods, by the inability to fully digest certain foods or by a disruption in the bacteria normally found in the colon.

Foods that cause excess gas

Foods that cause gas in one person might not cause it in another. Common gas-producing foods and substances include:

Foods that cause gas in one person might not cause it in another. Common gas-producing foods and substances include:

  • Beans and lentils
  • Vegetables such as cabbage, broccoli, cauliflower, bok choy and brussels sprouts (cruciferous vegetables)
  • Bran
  • Dairy products containing lactose
  • Fructose, which is found in some fruits and used as a sweetener in soft drinks and other products
  • Sorbitol, a sugar substitute found in some sugar-free candies, gums and artificial sweeteners
  • Carbonated beverages, such as soda or beer

Digestive disorders that cause excess gas

Excessive intestinal gas belching or flatulence more than 20 times a day sometimes indicates a disorder such as:

  • Autoimmune pancreatitis
  • Celiac disease
  • Crohn’s disease
  • Diabetes
  • Dumping syndrome
  • Eating disorders
  • GERD (gastroesophageal reflux disease)
  • Gastroparesis
  • Inflammatory bowel disease (IBD)
  • Intestinal obstruction
  • Irritable bowel syndrome
  • Lactose intolerance
  • Peptic ulcer
  • Ulcerative colitis

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