causes of stomach gas
Bloating and distention may be due to increased amounts of gas in the abdomen, but there also are other causes. Sometimes intestinal gas that is associated with bloating can be accompanied by. 1  abdominal pain, 2  stomach cramps, 3  swelling of the abdomen, 4  fibromyalgia,  a feeling of knots in the stomach.
Belching, also known as burping, is the act of expelling gas from the stomach out through the mouth. The usual cause of belching is a distended (inflated) stomach caused by swallowed air. The distention of the stomach causes abdominal discomfort, and the belching expels the air and relieves the discomfort.