There are more possible reasons for blood on the fart paper after going to the toilet, and the common ones include hemorrhoids, anal fissures, rectal tumors, and gastrointestinal bleeding. 1. Hemorrhoids: mainly manifested as bleeding and prolapse. Bleeding so that after the discovery of wiping paper with blood stains, mostly fresh blood, fresh blood can be attached to the stool. 2. Anal fissure: the most important symptoms are pain, blood in stool and constipation. The blood in the stool is mainly dripping during defecation or wiping blood on the paper after defecation, and the color of blood is bright red. 3. Rectal tumor: there are no symptoms in early stage, and the blood in late stage is mostly mucus-pus-blood, which needs further examination (such as enteroscopy, pathological examination, etc.) to help identify. 4. Gastrointestinal bleeding: the blood stool of upper gastrointestinal bleeding is mostly tarry black stool, and the lower gastrointestinal bleeding can be fresh blood stool. After going to the toilet, there is blood on the paper may also be other reasons, such as intestinal polyps, chronic colitis, chronic dysentery, upper gastrointestinal tract ulcers, esophagogastric fundus varices bleeding and other reasons. It is recommended to go to the regular hospital anorectal department, gastroenterology, general surgery and other related departments to improve the examination, clear diagnosis and follow the doctor’s instructions for treatment.