Excess upper intestinal gas may result from swallowing more than a usual amount of air while eating, drinking or chewing gum. Lower intestinal gas is the normal byproduct of bacterial action on food that is not broken down until reaching the colon. Intestinal gas related to bacterial action is made up of hydrogen, carbon dioxide and sometimes methane.

Foods that cause gas
Some foods contain substances that aren't fully digested until they are acted upon (metabolized) by the bacteria in the lower intestine, where they're broken down into simpler substances, including gas. Common gas-producing foods and substances include:

  • Beans and lentils
  • Dairy products containing lactose
  • Fructose and sorbitol, which are found in some fruits and are also used as sweeteners

Digestive disorders that cause gas
Excessive intestinal gas — belching or flatulence more than 20 times a day — sometimes indicates a digestive disorder such as:

  1. Celiac disease
  2. Dumping syndrome
  3. Food allergy or intolerance?
  4. GERD — Gastroesophageal reflux disease
  5. Gastroparesis
  6. Irritable bowel syndrome
  7. Lactose intolerance
  8. Peptic ulcer

Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.

Jun. 11, 2013