Colon polyp is a bulge in the epidermis of the colonic mucosa that protrudes into the lumen. Colonic polyps occur more often in the sigmoid colon and rectum, and are more common in males than females, with a higher incidence at older ages. The cancer rate of colon polyps is related to the tissue type, size and epithelial heterogeneous hyperplasia of polyps. I. Which polyps are easy to become cancerous? 1.Pathological changes 1) It is generally believed that polyps are pre-cancerous, and adenomas have the tendency of malignant transformation from the pathological point of view. (2) Polyposis can involve the whole colon, and the degree of malignancy is very high, accounting for about 60%. The larger the adenocarcinoma polyp is, the higher the malignant rate is. According to the statistics, among tubular adenomas, the cancer rate in rectum is 7.3%, while the cancer rate in sigmoid colon is 24.8%. Shape of polyps, broad-based polyps are easier to become cancerous than the pedunculated polyps, the cancer rate of pedunculated polyps is 4.5%, while the cancer rate of broad-based polyps is 10.2%, and the cancer rate of polyps without pedunculated polyps is obviously greater than that of polyps with pedunculated polyps. There are no obvious symptoms of colon polyps, but if there are symptoms such as blood in stool, change of bowel habit, abnormal shape of stool, etc., you need to go to the regular hospital for diagnosis and treatment in time. Blood in the stool is the most common symptom of colon polyps. However, many people mistake bleeding in the stool as a symptom of hemorrhoids, resulting in a delay in the best time for treatment. There is a fundamental difference between hemorrhoids and bleeding caused by colon polyps. Hemorrhoids caused by bleeding is often manifested as blood dripping after the stool, bright red, and colon polyps caused by bleeding is often mixed with the stool, bright red or dark red, mostly due to the surface of the polyp rupture. Second, found the following symptoms must do colonoscopy! 1, unexplained anemia 2, sudden weight loss 3, abdominal bloating, abdominal pain, indigestion, loss of appetite 4, anal or abdominal mass 5, blood in the stool or black feces 6, pus and blood or mucus blood in the stool 7, change in bowel habits, increased frequency or diarrhea, acute and severe after the 8, diarrhea and constipation alternately 9, the shape of the stool becomes thinner, flattened or with grooves 10, found to have multiple polyps or papillary adenomas Recommendation: Healthy adults older than 50 years of age should have a colonoscopy if available. Rectal (colon) polyps, colon cancer family history and diarrhea, constipation, blood in the stool history, physical examination found that blood CEA, CA199 increased, fecal occult blood positive, should be screened for colon lesions, the first choice is colonoscopy. No matter what kind of colon polyps, biopsies should be taken and sent for pathologic examination under endoscopy first.