There are several reasons to consider gas: 1, there is indigestion or diaphragm spasm, eat food is not easy to digest will appear full of gas, burping, there is such a problem is the spleen and stomach function is damaged, may have previously had chronic gastritis. 2, the gastrointestinal tract mucosa has ulcers, atrophic lesions, or inflammatory infections have congestion, edema, if you eat something to stimulate the gastrointestinal tract mucosa, will cause infection or injury further aggravated, then the secretion of pepsin, gastric acid, stay inside the stomach. If you eat something that irritates the mucosa of the gastrointestinal tract, it will cause further aggravation of the infection or damage, eat something that is not fully and timely digested, and then the secretion of pepsin, gastric acid, stay in the stomach is prone to produce some gas, which can lead to peristaltic dysfunction of the gastrointestinal tract, and if you encounter some raw and cold, stimulating food, it will cause diaphragm spasm, contraction of the gas. 3, because of the gastrointestinal tract infection of Helicobacter pylori This can lead to neurological dysfunction of the gastrointestinal tract.