The most common diseases are ulcerative colitis or colonic polyps. In addition, colonic tumors may also have the above symptoms, so it is necessary to go to the hospital as soon as possible to have an electronic colonoscopy to make it clear. If it is clear that it is a colon polyp, electrocoagulation and electrosurgery of the polyp should be performed under the electronic colonoscopy. If it is clearly ulcerative colitis, it needs to be regulated with medication such as mesalazine plus rectal enterosan or pepcid, and the course of treatment is lifelong. If the bleeding is heavy, another hormone like prednisone will be added to treat ulcerative colitis. If the examination is clear that the cancer is colon cancer, it is necessary to further clarify whether there is distant or peripheral tissue metastasis, and if there is metastasis, it is necessary to carry out chemotherapy and radiotherapy; if there is no metastasis, it is necessary to carry out surgical treatment.