Epigastric distension is mainly due to indigestion or upper abdominal discomfort caused by gastric distension caused by the decline of stomach function, mainly due to the increase of food or gas in the stomach and the feeling of fullness and pressure in the upper abdomen caused by the increase of pressure in the stomach. The main causes are as follows: First, indigestion caused by eating indigestible or irritating food. Second, gas accumulation in the stomach caused by eating excessive gas-producing food. Third, chronic gastritis, gastric ulcer, gastric dilatation, pyloric obstruction and gastric tumor and other organic lesions caused by gastric discomfort. Fourth, neurosis, endocrine disorders, dyspepsia caused by the decline in functional gastric function. Fifth, bloating caused by excessive carbon dioxide gas in the stomach due to excessive stomach acid caused by various reasons. In addition, drinking a lot of water and drinking excessive gas-producing drinks can also cause epigastric distension.