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Borborygmus also known as stomach growling or rumbling is the rumbling sound produced by the movement of gas through the intestines of animals, including humans. The word borborygmus is an onomatopoeia for this rumbling.The "rumble" or "growl" sometimes heard from the stomach is a normal part of digestion. It originates in the stomach or upper part of the small intestine as muscles contract to move food and digestive juices down the gastrointestinal tract and functions as a sort of intestinal "housecleaning". Sometimes it occurs as part of the migrating myoelectric complex.Although this muscle contraction happens whether or not food is present, rumbles are more common after the animal has gone several hours without eating. This may be why a "growling" stomach is often associated with hunger.Rumbles may also occur when there is incomplete digestion of food that can lead to excess gas in the intestine. In humans this can be due to incomplete digestion of carbohydrate-containing foods including milk and other dairy products , gluten , fruits, vegetables, beans, legumes, and high-fiber whole grains. In rare instances, excessive abdominal noise may be a sign of digestive disease, especially when accompanied by abdominal bloating, abdominal pain, diarrhea or constipation. It is thought that some borborygmi can be treated with the ingestion of olive oil, allowing the fatty acids to decrease the muscular contractions of the intestines.