Some of you might remember the digestive system diagram that you were taught and asked to redraw during your school. The lower part of the digestive tract include the large intestine (also called colon), followed by rectum and then the anus.
An anal fissure is a small cut or tears in the lining of the anus. This cut can cause severe pain and may even bleed a little when the person is passing stools. Streaks of blood can be noticed on the stools or on the tissues used to wipe the place. Most often, the tearing of the lining of anus is caused by hard and large stools in constipated people.