Blood in the stool all the time may be caused by hemorrhoids, ulcerative colitis, rectal tumors and other gastrointestinal diseases, but also hemophilia and other blood system diseases, should be promptly consulted to identify the cause. 1. Hemorrhoids: especially internal hemorrhoids, patients are prone to the symptoms of blood in the stool, manifested as painless, intermittent bleeding, sometimes dripping blood in the stool, bleeding can be severe jet, long-term repeated bleeding can also be anemia, accompanied by hemorrhoidal prolapse, local pain, itching and so on. 2. Ulcerative colitis: a chronic inflammatory disease of unknown etiology, with recurrent diarrhea, abdominal pain, mucus, pus and blood as the main clinical manifestations. The degree of blood in the stool is usually related to the severity of the disease, and in severe cases, there may be a large amount of blood in the stool. 3. Rectal tumor: for example, intestinal cancer, due to ulceration, erosion and bleeding on the surface of tumor, the symptom of blood in stool can also appear. The blood in stool caused by rectal cancer is usually bright red or dark red, and the bleeding can be mixed with stool to form mucus, pus and blood stool. 4. Hemophilia: patients with hemophilia can also have blood in stool due to thrombin generation disorder. In addition, rectal polyps, chronic bacillary dysentery, thrombocytopenic purpura, intestinal parasitic diseases (such as hookworm, etc.) may also appear long-term blood in the stool. Therefore, it is recommended to go to regular hospitals for timely consultation to clarify the cause of the disease and carry out targeted treatment to avoid delaying the condition.