The signs of atrophic gastritis turning into cancer are reflected in the following aspects: firstly, if the patient suddenly feels stomach discomfort, stomach pain, stomach distension and poor digestion on the basis of the original atrophic gastritis. Some patients may experience emaciation, fatigue, weight loss, fever, or vague pain in the upper abdomen, anemia and other symptoms, which must be taken seriously. Secondly, patients with atrophic gastritis to cancer will have gastroscopic gastric mucosa erosion, bleeding, ulcers, and even mucosal elevation or occupying lesions. Therefore, the patient must consult the doctor in time, and can take the lesion tissue to do pathological examination to clarify the nature of the lesion, so as to have targeted treatment.