There are no symptoms in the early stage of intestinal polyps, so we have to do regular checkups, such as stool tests to see if the patient has blood in the stool and colonoscopy to see if polyps exist. Once polyps are found through colonoscopy: 1. we have to determine the location of polyps, polyps located in the rectum and sigmoid colon are prone to cancer; 2. consider the age of the patient, the probability of polyps becoming cancerous increases gradually with age, especially for patients over 60 years old; 3. consider the size of polyps, generally polyps over 2 cm have a probability of becoming cancerous of more than 30%; 4. take biopsy through endoscopy to If it is benign polyp, it is not cancerous, if it is hyperplastic polyp or adenomatous polyp, it is possible to become cancerous, especially choroidal adenoma, which is especially prone to become cancerous, and patients need surgery after cancer.