Bowel cancer usually refers to colorectal cancer, and bowel cancer can usually be detected without a colonoscopy. Bowel cancer can be detected without colonoscopy, but also by going to the hospital for CT examination, PETCT examination, ultrasound in the rectal cavity and pathology examination. Colorectal cancer usually refers to malignant tumors of the colon and rectum, which may be caused by improper diet, hereditary factors, bad living habits and chronic diseases. Generally, symptoms such as loss of appetite, dyspepsia, fecal occult blood and blood in stool can be treated by surgery such as total mesorectal excision and low anterior resection under doctor’s guidance. In daily life, we should pay attention to rest, avoid overwork, appropriate exercise, improve immunity, reasonable diet and balanced nutrition. If you have any discomfort symptoms, you should go to the hospital in time and consult the doctor’s guidance.