The usual causes of blood in the stool tissue include: hemorrhoids, anal fissure, and intestinal diseases. 1. Hemorrhoids: mostly seen in internal hemorrhoids and mixed hemorrhoids. Its main clinical manifestation is fresh blood after stool, and the amount is usually small, sometimes the surface of the feces is attached to the blood, so there will be blood in the tissue after wiping the stool. 2. Anal fissure: when constipation will be more serious, manifested as stool with blood, and after defecation will feel severe pain. As the stool cracks the skin around the anus, blood will remain in the cracks, so there will be blood on the stool paper. 3. Intestinal diseases: for example, rectal cancer contains mucus and blood in the stool, which will also be manifested as blood on the stool paper, accompanied by symptoms such as thinning of stools and wasting; proctitis will also lead to blood in the stool or blood on the handkerchiefs, and sometimes there will be blood clots in the stools, which is due to inflammatory media leading to rectal mucosal congestion and edema; rectal polyps will not only lead to blood in the stool, but also abdominal pain, diarrhea and other discomforts. There are many reasons why there is blood in the stool tissue, there may be anal fistula, constipation, coagulation dysfunction and other diseases. It is recommended that patients seek medical attention, improve the examination, clear diagnosis and follow the doctor’s instructions to be treated, so as not to delay the condition.