Gastric ulcer is a type of peptic ulcer, that is, a chronic ulcer that occurs in the stomach and duodenum. It is a common disease. There are various factors that cause ulcers, among which the digestive effect of acidic gastric juice on the mucosa is the basic factor in the formation of ulcers. Any part of the body that is exposed to acidic gastric juice, such as the lower esophagus, the anastomosis after gastrointestinal anastomosis, the jejunum, and the Meckel diverticulum with ectopic gastric mucosa. The vast majority of ulcers occur in the duodenum and stomach, so it is also called gastric/duodenal ulcer. Among them, delayed gastric emptying and bile reflux, abnormal effects of gastrointestinal peptides, genetic factors, drug factors (such as aspirin, many anti-inflammatory analgesics, etc.), environmental factors and mental factors are all related to the occurrence of gastric ulcers. The main manifestations are upper abdominal pain, dull pain, distending pain, burning pain or hunger pain. About 10% of the population has suffered from peptic ulcers in their lifetime. This disease can be seen at any age, mostly between 20 and 50 years old, and more men than women.