There are many reasons for blood in the stool, and in terms of anorectology, the most common ones are hemorrhoids, anal fissures, intestinal tumors, colorectal polyps and so on. In recent years, with the increasing number of e-colonoscopy, more and more colon polyps have been “uncovered”. However, there are still many people who do not pay enough attention to colorectal polyps. In fact, colorectal polyps are more common, it is the lumen of the large intestine mucosa grows out of the bulge, a variety of forms, some like nipples, some like peas, some like strawberries, and some with a long tip. Most colorectal polyps occur after middle age and increase with age. Among them, colorectal adenomas increase significantly above the age of 40, with the incidence twice as high at the age of 50 and highest at the age of 60-80. Domestic data show that about 75% of colorectal polyps are seen in older people over 60 years of age. There are many types of colorectal polyps, the most common of which is adenoma, although this is a benign lesion, but as the adenoma continues to grow, the cancer rate increases, so colorectal adenoma is often considered a “precancerous lesion”. As the saying goes, “It’s easy to stop a gun, but it’s hard to prevent a hidden arrow”. It is not scary to have a colon polyp, but it is scary to have a colon polyp without realizing it. Most colorectal polyps are insidious and can be clinically asymptomatic. Some people even appear some digestive symptoms such as bloating, diarrhea, constipation, etc. are relatively mild and atypical, so they are often overlooked. Generally, most people come to the doctor with blood in the stool or mucus stool, and are often misdiagnosed as hemorrhoids and other anal disorders and delay the disease. Many patients with solitary colorectal polyps, who do not pay attention to the initial stage, are likely to transform to multiple colorectal polyps, and the chances of malignant change of multiple colorectal polyps are greatly increased! In general, it is more difficult to detect colorectal polyps with ordinary examination programs. At this time, e-colonoscopy is the best choice and very necessary to detect polyps hidden in the large intestine at an early stage, and then treat them early to remove the time bomb in the intestine. With the development of medical technology, nowadays, most colon polyps are removed without surgery. Endoscopic polypectomy is a very mature treatment method. It can be said that endoscopic polypectomy has become a routine method of intestinal polyp treatment, except for a very small number of large diameter, endoscopic morphology is obviously malignant or too many, generally can be endoscopically complete removal of intestinal polyps. Early detection of colorectal polyps and their timely removal under colonoscopy is one of the important prevention methods of colorectal cancer. In Japan, more and more people are using e-colonoscopy as a routine medical checkup. In China, for people with unexplained blood in stool or digestive symptoms, it is recommended to pay attention to colonoscopy to improve the detection rate of colorectal polyps. For middle-aged and older men who are over 40 years old, regular colonoscopy should be done even if they do not show any discomfort. The following three types of people belong to the high-risk group and should pay more attention to screening polyps and colorectal cancer. (1) parents with a history of colorectal cancer or a family history of adenomatous polyps; (2) themselves with a history of cancer or intestinal polyps; (3) those who have both of the following: chronic constipation, chronic diarrhea, sticky bloody stools, and a history of chronic appendicitis, etc.