Common precancerous lesions of gastric cancer mainly include gastric ulcer, gastric tumor polyp, as well as chronic atrophic gastritis and remnant stomach, etc. The above diseases may become cancerous if not treated timely. For gastric inflammatory hyperplasia, chronic gastritis, etc., cancer will not occur in general. However, for some chronic gastritis, if the treatment is not carried out timely and the cause of the disease is not removed, it may further develop to cause atypical hyperplasia of gastric mucosa, and atypical hyperplasia may be carcinogenic. Currently, it is believed that H. pylori and gastric cancer are highly correlated, and many gastric cancers are caused by H. pylori infection, so it is also necessary to check whether H. pylori is infected. If the test reveals H. pylori infection, H. pylori must be removed promptly. The current treatment includes triple therapy and quadruple therapy, all of which have good clinical effects. Therefore, patients must be examined and treated promptly once gastric disease occurs.