The main clinical manifestation of stomach cancer is epigastric pain, which can be accompanied by poor appetite, anorexia, emaciation, nausea, vomiting, black stool and anemia. If metastasis occurs, it will also cause corresponding clinical symptoms, such as difficulty in swallowing if it metastasizes to the lower esophagus. Frequent vomiting will exist if it is complicated by obstruction. If it is metastasized to the liver, it may cause right upper abdominal pain, jaundice, and fever. Most of the difficulties in defecation are considered to be constipation or hemorrhoids, but of course, tumors of the colon or metastasis of gastric cancer to the abdominal cavity cannot be ruled out. It is recommended that patients should go to the hospital if necessary, and they can cooperate with doctors to check abdominal CT and e-colonoscopy.