Insoluble fiber, on the other hand, passes essentially unchanged through the intestines and produces little gas. Wheat bran and some vegetables contain this kind of fiber. The most common symptoms of gas are belching, flatulence, abdominal bloating, and abdominal pain. However, not everyone experiences these symptoms. The determining factors probably are how much gas the body produces, how many fatty acids the body absorbs, and a person's sensitivity to gas in the large intestine.
Chronic symptoms caused by too much gas or by a serious disease are rare.
Belching An occasional belch during or after meals is normal and releases gas when the stomach is full of food. However, people who belch frequently may be swallowing too much air and releasing it before the air enters the stomach. Believing that swallowing air and releasing it will relieve the discomfort of these disorders, this person may unintentionally develop a habitual cycle of belching and discomfort. Frequently, the pain continues or worsens, leading the person to believe he or she has a serious disorder. The Meganblase syndrome, which causes chronic belching, is characterized by severe air swallowing and an enlarged bubble of gas in the stomach following heavy meals.