There are more reasons for patients to have diarrhea with blood in the stool, mainly including the following: 1. It may be the presence of hemorrhoids, generally patients suffering from treatment of hemorrhoids are very easy to have blood in the stool. If the patient has bleeding hemorrhoids during diarrhea, it will form diarrhea with blood. 2, it may also be caused by anal fissures, patients with anal pain or deformation when diarrhea, most of them are caused by anal fissures. 3, it may also be caused by bleeding from the gastrointestinal tract, common gastric ulcer and duodenal ulcer, this situation will also appear diarrhea with blood. 4, there may be It may also be caused by the medications taken by the patient, such as iron supplements and phenolphthalein preparations. In summary, there are more cases of diarrhea and blood in the stool, in addition to these, dietary problems can also cause the occurrence of blood in the stool.