Bleeding stool is mainly caused by the emergence of protrusions in the rectum and anal canal, as well as bleeding caused by extrusion during defecation, common conditions are mainly rectal polyps, internal hemorrhoids, etc. Rectal polyps are protrusive lesions growing on the mucous membrane of the rectal wall, mostly benign tumors can also deteriorate to form rectal cancer, the shape is mainly round. The polyp will gradually encroach on the space in the rectum and anal canal during the growth process, resulting in poor defecation, thin stool shape, and the polyp will easily fall off during defecation, resulting in blood in the stool and other symptoms, mostly blood in the stool, and not as dripping blood. Internal hemorrhoids mainly occur in the rectal wall above the dentate line, and when the nucleus of internal hemorrhoids is enlarged, it will also encroach on the rectal passage, causing thin stools and painless blood in the stool, which is more common with blood dripping and blood on hand paper, and sometimes there are also symptoms such as anal swelling.