Atrophic gastritis c3 is not gastric cancer, but atrophic gastritis c3 can be cancerous. Chronic atrophic gastritis is a kind of chronic gastric disease, which is mainly characterized by atrophy of gastric mucosal epithelium and glands, decrease in number, thinning of gastric mucosa, and thickening of mucosal musculature. c3 mainly refers to the area of atrophy, which is more than the gastric sinus and gastric angle and close to the cardia. When the growth of gastric mucosal epithelial cells is out of control, gastric cancer will be formed. Besides growing in the stomach wall and spreading to the neighboring organs, cancer cells may also enter the lymphatic system and form lymph node metastasis, and may spread outside the stomach and spread to other organs through the blood pathway or the shedding of cancer cells. If atrophic gastritis cannot get an effective treatment and further progress occurs, especially some intestinal epithelial hyperplasia and heterogeneous hyperplasia, some cancerous changes may occur. If atrophic gastritis is confirmed, it is necessary to review gastroscopy regularly, and at the same time search for the causes of atrophic gastritis and standardize the diagnosis and treatment.