The examination of bowel cancer and stomach cancer mainly depends on the clinical manifestations. Bowel cancer has clinical manifestations such as abdominal pain, blood in stool, wasting, etc. If it is rectal cancer, there will be stool obstruction, incomplete bowel movement and feeling of urgency and heaviness, while stomach cancer mainly has abdominal distension, poor nausea, black stool, progressive wasting, abdominal mass, etc. The main detection means are gastroscopy and colonoscopy. Gastric cancer is mainly detected by gastroscopy, which can detect filling, defect, local tumor ulcer and biopsy to find cancer cells, while colon cancer and rectal cancer can be diagnosed by full colonoscopy after adequate preparation of the intestine, which can clarify the diagnosis of colon cancer or rectal cancer. .