If there is bleeding in the anus when you urinate, you need to consider whether there is an anal disease. Generally, the following conditions may cause anal bleeding: a. Hemorrhoids, especially those formed by varicose veins under the rectal mucosa and the skin of the anal canal, are prone to bleeding symptoms in the acute attack period and are bright red in color, without obvious pain. Second, anal fissure, anal canal tissue surface skin cracking, repeated episodes of not easy to heal, will also appear anal bleeding and mainly fresh blood, most cases will be accompanied by more obvious pain. Rectal polyps, protruding meatballs are squeezed during defecation or urination, causing bleeding and other symptoms due to surface skin breakage. Rectal cancer, rectal cancer to a certain stage of development patients will appear bleeding symptoms, but the bleeding color is darker, it is recommended to carry out anoscopy and other related tests in order to determine the cause of the disease.