There are many reasons why there is blood on the toilet paper when wiping the buttocks. The first one, bleeding caused by hemorrhoids, if the patient has hemorrhoids, after eating a lot of irritating food or drinking alcohol, can cause the nucleus of the hemorrhoid to bruise and swell, and the nucleus of the hemorrhoid can rupture when wiping the stool, thus causing bleeding. Secondly, if the patient has anal fissures, this can also lead to blood on the surface of the paper when wiping the stool. Anal fissures are a relatively common condition where prolonged dry stools tend to damage the skin of the anal canal, which can lead to fissures that can be accompanied by pain and blood in the stool. Thirdly, if the patient has rectal polyps or rectal adenomas, this can also lead to bleeding when wiping stool. Long-term stool irritation can easily damage the blood vessels under the mucosa, which can lead to blood in the stool. Therefore, there are many reasons for blood when wiping stool, so you should actively go to the anorectal clinic, you can perform a rectal examination, and if necessary, put in anoscope to clarify the diagnosis.