Gas, also called flatus or flatulence, is air in the intestine that is passed through the rectum. Air that is passed from the digestive tract through the mouth is called belching.

Gas is formed in the intestines as food is being digested. Gas can make you feel bloated, which may cause crampy or colicky abdominal pain.

Gas can be caused by any of the following:

• Swallowing air while eating.
• Eating foods that are difficult to digest, such as fiber. If you recently introduced fiber into your diet, having gas may be temporary. Give it a little time. Your body may adjust and stop producing gas.
• Eating foods that you cannot tolerate -- for example, if you have lactose intolerance and eat dairy products.
• Irritable bowel syndrome -- a chronic form of stomach upset that gets worse from stress.
• Malabsorption (when your body cannot absorb or digest a particular nutrient properly, often accompanied by diarrhea).
• Antibiotics.

• Eat more slowly.
• Chew your food thoroughly.
• Avoid gum chewing.
• Relax while you eat.
• Avoid beans, cabbage, and carbonated beverages.
• Try Beano, a product sold over-the-counter at most drugstores, if you eat a lot of beans, fruits, vegetables, and other high-fiber foods.
• Walk for 10 to 15 minutes after eating.
• Drink peppermint or chamomile tea after a meal.