Blood in the stool or blood in the stool is a relatively common clinical symptom, generally if it is fresh blood and feces and blood do not mix together, it means that the location of bleeding is located in the rectum and anal canal is more likely, otherwise the bleeding site may be in the rectum or above. Specific blood in the stool are the following: 1, anal canal diseases, anal canal diseases are more common than hemorrhoids, anal fissure, anal fistula, etc.; 2, rectal diseases, rectal inflammation such as ulcerative colitis, radiation colitis, intestinal tuberculosis, as well as intestinal tumors, rectal tumors, rectal polyps, rectal injury, etc.; 3, colon diseases are infectious diseases, inflammation, tumors and polyps, etc.; 4, small intestine diseases mainly include infection and inflammation 5, there are also diseases of the stomach and esophagus, such as esophageal varices, gastroduodenal ulcers, etc. These are the more common diseases, but of course there are also systemic diseases such as vascular diseases, hemorrhagic colitis, allergic purpura and hereditary capillary dilation. The blood in the stool should not be dismissed as bleeding hemorrhoids, but should be seen by an anorectal specialist and a gastroenterologist in time for a clear diagnosis and treatment.