The anal canal is the end part of the intestinal tract. It includes the rectum and anus. Stool is passed through the anus. Sometimes a crack or tear occurs in the lining of the anal canal.
A to Z: Anal Fissure
Anal Fissure (Child)
Jump to content. An anal fissure is a tear in the lining of the lower rectum anal canal that causes pain during bowel movements. Anal fissures don't lead to more serious problems. Most anal fissures heal with home treatment after a few days or weeks.
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An anal fissure can occur when someone passes a large or hard stool poop , which stretches the lining of the anus until it tears. It also can happen when frequent diarrhea irritates the lining. You may also see blood on the stool, baby wipes, or toilet tissue. In infants, anal fissures are very common and tend to heal completely with basic care, including soaks and ointment. In older kids and teens, the cuts can take several weeks or longer to heal and sometimes tear open again.