Men with stomach pain and bleeding stools are considered to have the following causes: 1. ulcerative colitis, the most typical symptom of which is mucopurulent bloody stools and regular stomach pain; patients first have stomach pain and then have the urge to defecate, and the stomach pain will improve after defecation; 2. anal diseases, such as hemorrhoids, anal fissures and rectal polyps, when the attack occurs, patients will have bleeding stools, and some of them are accompanied by stomach pain; 3. Some of them are accompanied by stomach pain; 3. It may also be enteritis. Considering the complexity of the cause, patients with this symptom should go to a hospital anorectal department for rectal examination or anoscopy to determine the cause and then cooperate with the doctor for treatment.