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. An anal fissure usually isn’t a serious condition. It can affect people of all ages, and it’s often seen in infants and young children since constipation is a common problem in these age groups.
In rare cases, an anal fissure may develop due to
For adults, the following may help prevent anal fissures: