Nitroglycerin ointment can be used to treat anal fissures, and it can be used to cure fissures with mild symptoms because the main ingredient in this ointment is nitroglycerin, which is an oil-based ointment. When applied to the fissure area, it can relieve the spasm of the anal sphincter caused by the fissure, relieve the pain caused by the tearing of the skin to a certain extent, stretch the blood vessels and expand the blood vessels, improve the blood supply to the anus to a certain extent, and help the fissure to heal. In case of repeated anal fissures, symptoms such as inflammation, pus, bleeding and itching of the fissure may occur, and medication is not very useful and can at best only temporarily relieve the symptoms, requiring surgical excision for treatment.