Bleeding from the butt (rectal bleeding) can have many causes, most of which are common and not serious. Common reasons include:

• Anal fissure: a small tear in the lining of the anus that often causes bright red bleeding and pain during bowel movements.
• Hemorrhoids (piles): swollen blood vessels in the anus or rectum that can bleed when passing stool.
• Constipation or passing hard stools, which can cause tears or strain.
• Anal fistula: a small infected channel near the anus that can cause bleeding and pain.
• Less commonly, conditions like colon polyps, inflammatory bowel disease (Crohn’s disease or ulcerative colitis), infections, diverticular disease, or, rarely, cancers of the colon or rectum.

Bleeding is often bright red if it comes from the anus or lower rectum. It is important not to ignore rectal bleeding, even if it is minor or infrequent, because some causes may require medical treatment or investigation. If experiencing rectal bleeding, particularly if it is persistent, associated with pain, changes in bowel habits, weight loss, or large amounts of blood, it is advised to see a healthcare professional for diagnosis and appropriate care.