Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs Anal fissureUpdated: 2017-06-13OverviewAnal fissure is a small tear in the tissue that lines the anus. It may occur when passing hard or large stools.SymptomsIt causes pain and bleeding during bowel movements, and may cause spasms in the ring of muscle at the end of the anus.TreatmentsThis condition usually heals on its own in 4 to 6 weeks. If it doesn't, treatment or surgery can relieve pain. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use