Bowel cancer check out mainly relies on the following aspects: I. Symptoms: the discomfort felt by the patient himself, for example, bowel cancer may more often appear abdominal pain, constipation, diarrhea, blood in the stool, emaciation and other symptoms. Symptoms: the problematic places found by the doctor after checking the patient, for example, there is a project of anal fingerprinting in routine physical examination, and the doctor touches the patient’s intestinal tract with tumor through anal fingerprinting. Third, auxiliary examination: some auxiliary examinations that must be done to diagnose bowel cancer include abdominal CT, colonoscopy and pathological examination of intestinal tumors, etc. Especially, pathological examination is the gold standard for diagnosis of bowel cancer.