The difference between stomach cancer and intestinal cancer lies in the location where the cancer occurs; stomach cancer refers to cancer lesions occurring in the stomach cavity, while intestinal cancer refers to cancer occurring in the intestinal tract. The main clinical manifestations of gastric cancer are irregular upper abdominal pain with nausea, vomiting, acid reflux, poor appetite, emaciation, anemia and weakness, etc. Meanwhile, patients with gastric cancer will have upper gastrointestinal bleeding when ulcers or erosions occur in the cancer foci, so it will cause black stool. The main clinical manifestations of intestinal cancer are abdominal pain with change in stool habit and stool characteristics, such as lower abdominal distension or middle abdominal distension with constipation, diarrhea, alternating constipation and diarrhea, black stool, bloody stool, emaciation and anemia. For the diagnosis of gastric cancer, patients need to undergo electronic gastroscopy plus pathological biopsy. For the diagnosis of bowel cancer, patients need to undergo electron gastroscopy plus pathological biopsy. No matter it is stomach cancer or intestinal cancer, patients are recommended to cooperate with doctors for surgery as soon as possible.