In 1994, Loder et al. put forward the hemorrhoid occurrence of the “anal cushion downward movement theory”, that is, its occurrence is due to the fixed anal cushion Treitz muscle damage or rupture, resulting in anal cushion prolapse and downward movement caused by the hemorrhoids, with the people to the hemorrhoids of the nature of the occurrence of the mechanism of understanding of the deepening, the hemorrhoid treatment in the concept of the concept and the method of great changes in the hemorrhoid. The change of the concept and method of treatment of hemorrhoids is very big. In April 2000, the Chinese Medical Association of Surgery Branch of the anal and intestinal surgery group of the concept of hemorrhoids for a new definition: “hemorrhoids are anal cushion pathological hypertrophy, displacement and perianal subcutaneous vascular plexus blood flow stagnation of the formation of the local mass.” The evolution of the anal cushions into hemorrhoids is predicated on congestion of the anal cushions, and congestion can lead to hypertrophy of the cushions. There are two main reasons for anal pad congestion: the smooth muscle of the anal pad support tissues cannot retract the pads back into the anal canal after defecation; and the tight anal sphincter prevents the return of blood within the pads. Based on the above theory, clinically can be divided into: 1, internal hemorrhoids: anal cushion displacement and pathological hypertrophy, including vascular plexus expansion, fiber support structure relaxation, fracture. 2, external hemorrhoids: refers to vascular external hemorrhoids, that is, perianal subcutaneous vascular plexus dilatation, manifested as a raised soft mass. 3, mixed hemorrhoids: internal hemorrhoids and the corresponding parts of the external hemorrhoid fusion. Normal people in the anal canal and rectum end of the mucous membrane under a kind of called “anal cushion” special tissue structure, this kind of organization in the fetus is formed, its function is to assist the normal closure of the anus, play the role of restraining defecation, as if the role of faucet washer general. Under normal circumstances, the anal cushion loosely attached to the rectal anal canal muscle wall, defecation by abdominal pressure is pushed down, defecation with the help of its own contraction function, retracted to the anal canal. When the anal cushion occurs after congestion, hypertrophy, relaxation and fracture, its elasticity retraction weakened, and thus gradually moved down, prolapse, and lead to venous stasis and varicose, and over time the formation of hemorrhoids. This viewpoint has been recognized by more scholars in recent years. After the formation of hemorrhoids, not everyone will have symptoms, there are symptoms of hemorrhoids called hemorrhoidal disease. The actual hemorrhoids that people usually talk about are actually hemorrhoids. Hemorrhoids can be divided into internal, external and mixed hemorrhoids depending on where they occur.