In this clip, Doctor Susan Jewell explains what causes of the formation of hemorrhoids. She draws a diagram to illustrate how hemorrhoids are formed in the anus region. She draws the sphincter muscle and the anus region, explaining that the anus is a ring of circular muscles, which contract and relax when passing stool. This whole area, she explains, is supplied by many blood vessels. Hemorrhoids are formed when there is increased pressure on these blood vessels, from excessive body weight or from a fetus, for example, in the case of a pregnancy. The pressure...