Fissures result from the stretching of your anal mucosa beyond its normal capacity. This often happens when stools are hard due to constipation. Once the tear. Anal fissures typically cause pain and bleeding with bowel movements. anal fissure by taking measures to prevent constipation or diarrhea. Definition: An anal fissure is a tear or break in the skin at the anus. Unfortunately, this leads to worsening constipation and when the child finally poops after.