Blood in the stool has little to do with whether the stool is dry or not, but mainly depends on the condition of the intestinal tract disease itself. If the color of blood in the stool is bright red and covers the surface of the stool, the possibility of bleeding hemorrhoids is high. If the blood is mixed with the stool, dark red, accompanied by abdominal pain and distension, loss of appetite, weight loss and other discomforts, the possibility of intestinal tumors should be considered. In elderly patients with a history of hypertension, diabetes mellitus, or heart disease, the presence of abdominal pain followed by fresh blood in the stool with a bright red color requires attention to consider the possibility of ischemic enteropathy, pay attention to the value of D-dimer, and suggest perfecting colonoscopy to clarify the lesion. In young patients with abdominal pain, diarrhea, fever, small amount of blood in stool with bright red color, it is necessary to consider the possibility of mucosal damage caused by gastroenteritis, and it is recommended to improve the e-colonoscopy and routine blood tests. For blood in the stool, it is recommended to improve the e-colonoscopy to clarify the lesion.