Blood in the stool is seen in the following cases: a. Acute enteritis, because the abdomen is cold, after eating an unclean diet or food contaminated by bacteria or viruses, there are acute intestinal inflammatory lesions, then there will be diarrhea, abdominal pain, blood in the stool. The nature of the inflammation can be clarified through routine blood and stool tests, and can be treated with oral levofloxacin or probiotics. Second, ulcerative colitis, ulcerative colitis is an immune dysfunction, resulting in inflammatory changes in the colon disease, its main manifestations are pulling mucus-purulent stool, diarrhea, abdominal pain, can be treated by oral mesalazine. Colon tumors, colon tumor cells infiltrate the intestinal mucosa resulting in destruction of the intestinal mucosa, damage to the blood in the stool and poor defecation and other manifestations, colon tumors can be clearly diagnosed after surgery or radiotherapy. Fourth, hemorrhoids, hemorrhoids are caused by varicose veins around the anus, when the stool is dry, the varicose veins are cut and cause bleeding in the stool, hemorrhoids can be treated by anal suppositories, hemorrhoid suppositories and other drugs. In addition, when the upper gastrointestinal tract bleeds heavily due to the relatively large amount of bleeding, it can also manifest as dark red stools, along with the manifestations of shock such as panic, chest tightness, and cold sweat. For blood in the stool need to go to the hospital for detailed examination, clear diagnosis after symptomatic treatment.