The reason for bleeding stool with pain is mainly because: 1, the anal opening has hemorrhoids caused when eating spicy, irritating food, or in the usual stir-fry put a lot of seasonings, because these foods can not be fully digested and absorbed by the gastrointestinal tract, it will be discharged with the stool. When dry stool passes through the anal opening, it can cause tearing of the anal opening, which leads to bleeding and pain. 3, mainly because usually do not pay attention to the hygiene of the anal opening, resulting in a large number of bacteria and viruses breeding in the anal opening, even through the anal opening into the rectal mucosa. These bacteria and viruses can secrete a large amount of toxic substances and inflammatory media, which will constantly stimulate the skin and blood vessels around the anus causing bleeding and pain.