Bowel cancer includes colorectal cancer and small bowel cancer. The more common clinical manifestations of colorectal cancer include bleeding stools, change in stool characteristics, such as thin stools or constipation and diarrhea. Like small intestine cancer, there may be black stool, and there may be nausea, vomiting, abdominal distension, abdominal pain and abdominal masses, while large intestine cancer may also have abdominal masses. Severe ones, including small and large intestine cancer, may have intestinal obstruction. Sometimes, emergency surgery is needed for treatment. Generally, bowel cancer can be diagnosed through pathological examination by colonoscopy, and if the diagnosis of bowel cancer is confirmed, surgery is the main treatment. As long as the stage is not too late and there is no extensive metastasis, surgery is generally possible. After surgery, systemic treatment, including adjuvant radiotherapy and adjuvant chemotherapy, is also needed. Bowel cancer is also a systemic disease and a wasting disease, so postoperative diet and nutrition should be kept up, which also helps anti-tumor treatment.