Patients with stomach pain should be alerted to the possibility of stomach cancer, because the symptoms of stomach disease are not typical, usually manifested as hidden pain, distension, or dull pain, accompanied by digestive symptoms, such as nausea, vomiting, acid reflux, belching, burping, etc. It is recommended to have gastroscopy because it is more direct to find out whether the lesion inside the stomach is stomach cancer or gastritis or gastric ulcer. Gastroscopy is recommended because it is more direct and can find out whether the lesion in the stomach is gastric cancer, gastritis or gastric ulcer. If there is a mass or ulcerative lesion in the stomach, and there is a bulge around the ulcer, like a crater, the possibility of gastric cancer is also very high, and it is necessary to take the pathology, and we will know whether it is gastric cancer or not when the pathology result comes out.