There are two possibilities for bleeding bowel movements without pain: first, it may be due to excessive diarrhea, which causes edema of the internal hemorrhoids inside the anus resulting in bleeding. You need to relieve the symptoms of diarrhea in time, you can use anti-diarrheal drugs under the guidance of a doctor. Secondly, patients may suffer from colon polyps because they are weak, plus they have been in diarrhea for some time, repeatedly stimulated by the stool become more fragile, more prone to bleeding, and no pain. Once the patient has bleeding when diarrhea, but no pain, you need to promptly distinguish what causes the bleeding, it is recommended to go to the hospital to do the anorectal examination. If it is found that the patient really has colon polyps, surgery will be needed.