The causes of bleeding in the stool are as follows: First, the most common cause is hemorrhoids, internal hemorrhoids bleeding, painless, external hemorrhoids bleeding smaller, but painful, the patient can be warm salt water cleaning or potassium permanganate sitz bath and then apply hemorrhoid cream. Second, there may also be upper gastrointestinal bleeding often accompanied by black stools, the cause may be gastric ulcer, duodenal ulcer, gastritis and so on. At this time the blood vessels in the digestive tract rupture triggered bleeding, it is recommended that patients go to the hospital to do a gastroscopy to diagnose the cause of the disease so as not to delay the condition. Third, anal fissure can also lead to bleeding in the stool, the patient constipation or stool is too hard to cause blood vessel rupture of the anal mucosa leading to bleeding. Fourth, colon diseases, such as colon tumors, ulcerative colitis, dysentery and other symptoms often accompanied by abdominal pain, diarrhea. It is recommended that patients usually eat a light diet, regular meals, exercise to improve the body’s immunity.