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The bowel sound is that when the bowel moves, the gas and liquid in the bowel flow with it, producing an intermittent grunt or the sound of gas passing through the water. Due to the imbalance of the intestinal flora, because various bacteria are fermented in the intestine, a large amount of gas is generated, which causes the contents of the gastrointestinal tract to be excessively large or move beyond the normal, so abnormal bowel sounds will occur.