The stomach is usually affected by diseases such as damage to the gastric mucosa, gastric dysfunction, food elimination disorders, and tumors. In the inner layer of the stomach there is a mucous membrane that secretes mucus to protect the stomach wall from the invasion of gastric acid. When the protective barrier of the mucous membrane of the stomach is damaged, gastric acid will directly infringe on the stomach wall, which will cause the onset of gastritis, gastric ulcer, gastric erosion, duodenal ulcer and other diseases. Food is digested mainly through the peristalsis of the stomach to grind and putrefy the food, once the peristaltic function of the stomach is disturbed, it will also induce gastric diseases, and common diseases include indigestion, gastric neurosis, gastric ptosis. After digestion, food needs to pass through the pylorus in order to be discharged into the duodenum, and once the pylorus is diseased, it will affect the discharge of food, such as pyloric obstruction. Long-term inflammation in the stomach will lead to atypical hyperplasia of epithelial cells, and the possibility of stomach tumors will be more, the tumor is divided into benign and malignant, benign is mainly gastric polyps, malignant is mainly gastric cancer.