Stomach cancer is a kind of malignant tumor of digestive tract which is relatively common in clinic, and the shape of stool in early stage of stomach cancer is not regular. Some patients with early stage of stomach cancer do not have any special symptoms, and their bowel movement is the same as normal bowel movement. However, although there is no change in the shape of feces in early stage of stomach cancer, occult blood in feces or black feces are more common. Therefore, gastroscopy or colonoscopy is necessary to detect early gastric cancer as early as possible so that it can be completely cured by surgery. Meanwhile, radiotherapy and chemotherapy should be carried out as early as possible after surgery to kill the remaining stomach cancer cells, which is more conducive to improving the survival period and cure rate of stomach cancer.