You should go to the anorectal department for treatment of blood in the stool. The common diseases with blood in the stool are hemorrhoids, anal fissures and rectal polyps, which mainly occur near the anus, and the anorectal doctors have more contact with them. If the bleeding is bright red, basically you suspect bleeding near the anus, mainly internal hemorrhoids, anal fissures and rectal polyps bleeding, depending on the symptoms, can be treated with topical drugs or surgery. If the color of the stool (bleeding) is black or dark black, this chocolate colored bleeding will be further examined and requires suspicion of possible upper intestinal bleeding or stomach bleeding, which needs to be combined with e-colonoscopy or e-gastroscopy for a comprehensive evaluation and diagnosis.