Bleeding from diarrhea may be caused by hemorrhoids, bacillary dysentery, ulcerative colitis and other factors. 1. Hemorrhoids: Hemorrhoids are considered to be caused by varicose veins around the anus, and impaired venous return may lead to venous stagnation. Frequent diarrhea or dry stool is likely to lead to venous rupture, so may cause diarrhea bleeding phenomenon. 2. Bacteriophageal dysentery: If the patient’s intestinal tract is infected with bacteria and other microorganisms, the intestinal mucosa may become congested and edematous, and even the small blood vessels may rupture, which may be manifested as bleeding. 3. Ulcerative colitis: if the patient has ulcerative colitis, ulceration in the intestinal tract, etc., it will be manifested as diarrhea and blood, when blood is often mixed with pus. Mucus, pus and blood stools can occur. The situation of diarrhea with blood also cannot be excluded as digestive tract tumor cancer or acute enteritis and other diseases. Patients also need to go to the hospital for timely medical treatment, do further examination, and deal with the cause of the disease.