The main manifestation of anorectal cancer in the early stage is the change of stool habit, such as more frequent bowel movements, frequent bowel movements, feeling of incomplete bowel movements and difficult bowel movements, as well as the change of stool characteristics, such as unformed stool and thinner stool than before. In this case, it is especially important to pay attention to the appearance of bloody stools, which can cover the surface of the stool or be mixed with the stool, causing itching and pain in the anus. Therefore, it is important to pay attention to the change of stool habit, especially the bloody stool. At present, the incidence of colorectal cancer is gradually increasing, which may be related to dietary habits. Patients should go to regular hospitals for routine colonoscopy when they have bloody stools, which can clarify the nature of bleeding and also confirm the diagnosis.