Blood in the stool depends on whether it is blood covered on the surface of the stool or blood mixed inside the stool. If it is blood covered on the surface of the stool, it is most often internal hemorrhoid bleeding or anal fissure bleeding, and bleeding from rectal polyps or rectal cancer in a lower location may also occur. If it is internal hemorrhoid, low located rectal polyp or rectal cancer bleeding, most of them do not have perianal pain and other discomfort, and may have prolapsed lumps at the anal opening. In the case of bleeding anal fissures, there is mostly anal pain during and after defecation. If the stool contains mixed blood inside, it may be ulcerative colitis, higher located rectal cancer, rectal polyps or colon polyps colon cancer bleeding, patients with ulcerative colitis may have recurrent abdominal pain, and colorectal polyps and colorectal cancer may not have any symptoms in the early stage except blood in the stool. No matter which of the above diseases, it is necessary to perform anal finger diagnosis, anoscopy and colonoscopy in the general surgery clinic of a regular hospital to clarify the cause, and if similar conditions occur repeatedly, it is necessary to seek early diagnosis and treatment as soon as possible