Occasional blood in the stool needs to be alerted to ulcerative proctitis, rectal polyps, and hemorrhoids as the cause. During an attack of ulcerative proctitis, the patient’s rectal mucosa will not only become congested and edematous, but also have an ulcerated surface. The passage of feces can cause some irritation to the ulcerated surface, and some people may experience bleeding. In addition to occasional bleeding, many patients with ulcerative proctitis may experience abdominal pain, diarrhea, and bloating. When polyps appear in the rectum, the rectal mucosa becomes inflamed, and the polyps are surrounded by a large number of blood vessels, which can cause bleeding due to the friction caused by the passage of feces. The bleeding caused by internal hemorrhoids occurs after a bowel movement, and the blood is bright red.