Blood in stool can be roughly divided into two types according to the color of blood in stool: the first type of blood in stool is bright red bleeding, this bright red bleeding is usually located near the anus, doing anoscopy or proctoscopy can determine the location of bleeding, can be clearly diagnosed, common diseases such as internal hemorrhoids, anal fissure or rectal polyps, bleeding are bright red. It can be treated conservatively or surgically according to the symptoms, and the effect of treatment is still relatively good. The second kind of bleeding is dark red bleeding, this kind of bleeding is upper gastrointestinal stomach bleeding or upper segment colon bleeding, need to combine with e-colonoscopy or gastroscopy to determine the location of bleeding, can clearly diagnose, common diseases are stomach tumor, stomach ulcer, intestinal tumor, intestinal inflammation, clear diagnosis can be symptomatic treatment.