Gastric cancer is one of the most common malignant tumors, and its incidence rate ranks the 3rd among malignant tumors. The number of new cases of gastric cancer worldwide reaches more than 1 million times every year, and China is one of the countries with high incidence and mortality rates of gastric cancer. Stomach cancer has an insidious onset and most patients are already in the progressive stage when they are diagnosed. Therefore, if you have stomach disease, you should check it as early as possible. In addition, tumorigenesis is a gradual evolutionary process, which has to go through several pathological processes, including chronic non-atrophic gastritis, atrophic gastritis, intestinal epithelial hyperplasia, epithelioid neoplasia, and carcinoma. Therefore, if gastroscopy pathology suggests atrophy, intestinal chemosis, atypical hyperplasia or epithelioid neoplasia, it is important to follow up regularly. Early detection, early diagnosis and treatment.