Back to Health A to Z. An anal fissure is a tear or open sore ulcer that develops in the lining of the large intestine, near the anus. Do not let embarrassment stop you seeking help. Anal fissures are a common problem GPs are used to dealing with.
An anal fissure is a small tear in the thin, moist tissue mucosa that lines the anus. An anal fissure may occur when you pass hard or large stools during a bowel movement. Anal fissures typically cause pain and bleeding with bowel movements. You also may experience spasms in the ring of muscle at the end of your anus anal sphincter. Anal fissures are very common in young infants but can affect people of any age.
Faeces poo is temporarily stored in the rectum and expelled from the body via the anus. An anal fissure is a tear or split in the lining of the anus anal mucosa. The symptoms and signs include pain when passing a bowel motion and bright red blood from the anus. The problem is common in children younger than one year, and affects around eight out of 10 babies.
We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. An anal fissure is a break in the skin of the anus.