Thanks for your feedback! Most cases occur in people etiology anal fissure have constipationwhen a particularly hard or large poo tears the lining of the anal canal. Cure hemorrhoids: it is very easy with this remedy Christine Dingle - Dec 2, 0. Cleaning the anus with the soft tissue of the face is better than using regular toilet paper. Narcotic pain medications are avoided because etiology anal fissure can cause constipation which could make the situation worse.