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What causes gas in the digestive tract?

Normal breakdown of certain undigested foods by harmless bacteria naturally present in the large intestine (colon). Some carbohydrates (sugar, starches, and fiber) are not digested or absorbed in the small intestine because of a shortage or absence of certain enzymes. The undigested or unabsorbed food then passes into the large intestine, where harmless and normal bacteria break down the food. This process produces hydrogen, carbon dioxide, and, in about one-third of all people, methane gases, which are released through the rectum.

Aerophagia (air swallowing) is usually caused by eating or drinking rapidly, as well as by chewing gum, smoking, or wearing loose dentures. Belching is the way most swallowed air leaves the stomach. The remaining gas is partially absorbed into the small intestine and a small amount goes into the large intestine and is released through the rectum.

 

More information on gas in the digestive tract

What is gas in the digestive tract? - Gas in the digestive tract is created from swallowing air, the breakdown of certain foods by the bacteria that are present in the colon.
What causes gas in the digestive tract? - The undigested or unabsorbed food then passes into the large intestine and produces hydrogen, carbon dioxide, and methane gases, which are released through the rectum.
Which foods cause gas? - Most foods that contain carbohydrates can cause gas, fats and proteins cause little gas. The sugars that cause gas are raffinose, lactose, fructose and sorbitol.
What are the symptoms of gas? - The most common symptoms of gas are belching, flatulence, abdominal bloating and abdominal pain. Some people have pain when gas is present in the intestine.
How is gas in the digestive tract diagnosed? - In addition to a complete medical history and physical examination, your physician may suggest some activities to assist in the diagnosis.
What is the treatment for gas in the digestive tract? - The most common ways to reduce the discomfort of gas are changing diet, taking medication, and reducing the amount of air swallowed. 
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Topics in digestive disorders

Signs and symptoms of digestive diseases
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Diverticular disease
Inflammatory bowel diseases
Malabsorption
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Peptic disorders (Stomach disease)
Emergencies of digestive system
Liver diseases
Irritable bowel syndrome
Diagnostic tests for digestive disorders
 

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