What causes rectal bleeding after a colonoscopy?

Bleeding in the stool after a colonoscopy may result from mucosal injury sustained during the procedure, or it may be caused by internal hemorrhoids. Additionally, colitis or proctitis cannot be ruled out. If post-colonoscopy rectal bleeding persists without improvement, it is advisable to seek evaluation at a reputable hospital for a thorough examination to identify the underlying cause and receive appropriate, targeted treatment.