There are three main causes of fresh blood in the stool: 1. Enteritis. This cause is more common, mostly occurs after unclean diet, accompanied by abdominal pain, diarrhea, stools with mucus, blood, and some patients have symptoms such as elevated body temperature and vomiting. The number of leukocytes in the examination of blood routine is elevated, and the number of leukocytes in the stool routine is also elevated. 2, hemorrhoids. The incidence of hemorrhoids is also relatively high, mainly due to sedentary, tobacco and alcohol stimulation, etc., triggering the perianal mucosa expansion, congestion, and eventually triggering the blood in the stool. 3, anal fissure. Anal fissures are easy to identify compared to the above diseases. Generally, anal fissures have more regular pain, and there is no obvious pain before defecation, while obvious pain can appear after defecation. For the identification of the above three diseases, it is best to consult the Department of Proctology for further identification to determine the treatment plan.