Hello - thanks for asking your question.
There are many causes for rectal bleeding. Of course, the cause that everybody is wary of is cancer. It is unlikely in someone as young as you. However, you definitely need to be evaluated by your personal physician.
Hemorrhoids is the most common cause of rectal bleed under the age of 50. Painless bleeding is usually associated with a bowel movement. Bright red blood typically coats the stool at the end of defecation. Blood may also drip into the toilet or stain toilet paper. Hemorrhoidal bleeding is almost always painless. Thus, bleeding associated with painful defecation should prompt investigation for other causes such as anorectal fissures.
Clinical trials have demonstrated that adding fiber to the diet through supplementation commercially available fiber preparations may significantly reduce bleeding episodes associated with hemorrhoidal disease.
Other less likely causes you should consider is an anal fissure, diverticulosis, colon cancer or polyps, inflammatory bowel disease and infectious colitis or gastroenteritis.
Evaluation should be performed with an anoscopy and/or endoscopy.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.