Rectal cancer prevention requires treatment of related diseases, maintaining good dietary habits and regular physical examination. 1. Treatment of related diseases: mainly refers to familial adenomatous polyposis, inflammatory bowel disease and so on. If there are related diseases, it is necessary to consult the doctor as soon as possible and actively treat them to promote mucosal repair, which is conducive to the reduction of cancerous changes. 2. Maintain good living habits: exercise appropriately, drink more water, eat more fresh vegetables and fruits, and eat less pickled, high-fat, deep-fried food to increase dietary fiber intake. 3. Regular medical checkups: If you have a family genetic history, try to have a medical checkup once a year. If you have constipation, diarrhea and other symptoms, it is recommended that you consult a doctor in time for treatment. It is recommended to change one’s behavior and behavioral style, and those with genetic history should have regular medical checkups to achieve the purpose of preventing rectal cancer.