The appearance of blood in the stool does not hurt need special attention, must be clear as soon as possible the cause of the following reasons: 1, internal hemorrhoids, is one of the most common causes of blood in the stool. Internal hemorrhoidal bleeding is mainly paper with blood, blood dripping and jet appearing performance, blood is bright red, not mixed with stool, through the finger diagnosis and clinical manifestations can be diagnosed, it is better to identify. 2, rectal polyps, intestinal polyps are now more and more frequent, the presence of blood in the stool, but not a lot of blood, often accompanied by diarrhea, abdominal pain and other clinical manifestations. 3, intestinal ulcers, due to the presence of ulcerated surfaces, the stool will be mixed with mucus, blood mixes with it. 4, intestinal tumor, the tumor is more serious will be accompanied by blood in the stool, blood in the stool is dark red, mixed with stool, microscopy and pathological examination can confirm the diagnosis. These are the common clinical causes, which should be diagnosed according to the patient’s performance and relevant examination.