There is a special layer of tissue under the mucous membrane of the anal canal, with sponge-like characteristics, its volume is small under pressure, in the case of decompression (bowel movement) will be filled with blood and expansion, by the veins, smooth muscle, elastic tissue and connective tissue, known as the vascular cushion of the anal canal, referred to as the anal cushion. It plays the role of closing the anal canal and restraining defecation. Under normal circumstances, the anal cushion loosely attached to the muscle wall of the anal canal, defecation is mainly by the downward pressure and was pushed downward (leaving the anal canal will be swollen), after defecation by its own contraction, retracted to the anal canal. After the elastic retraction effect is weakened, the congestion of the anal cushion moves down to form hemorrhoids. What are the types and clinical manifestations of hemorrhoids? Different types of hemorrhoids have different manifestations and can present with different symptoms. There are three types of hemorrhoids depending on where they are located. Hemorrhoids occurring above the dentate line are called internal hemorrhoids; hemorrhoids occurring below the dentate line are called external hemorrhoids; hemorrhoids occurring above and below the dentate line are called mixed hemorrhoids. 1. internal hemorrhoids degree and clinical manifestations: internal hemorrhoids degree: Ⅰ degree: blood, drip blood or jet bleeding, bleeding can stop by itself, no hemorrhoidal prolapse. Ⅱ degree: bleeding during bowel movement, hemorrhoids prolapse during defecation, can be self-contained after defecation; Ⅲ degree: occasional bleeding during bowel movement, hemorrhoids prolapse during defecation or prolonged standing, coughing, straining, weight-bearing, need to be returned by hand. Ⅳdegree: occasional bleeding during bowel movement, hemorrhoids prolapse can not be returned or returned and then prolapse. Ⅰ degree; Ⅱ degree of internal hemorrhoids is the main clinical manifestation of bleeding, painless intermittent fresh blood during stool is a common manifestation of internal hemorrhoids. The main clinical manifestation of internal hemorrhoids is bleeding, and painless intermittent fresh blood during bowel movement is a common manifestation of internal hemorrhoids. 2. external hemorrhoids, the main manifestation is anal discomfort, moist unclean, sometimes itching. If thrombosis occurs, there is severe pain. Thrombosed external hemorrhoids are the most common. Connective tissue external hemorrhoids (dermal prolapse) and inflammatory external hemorrhoids are also more common. Simple external hemorrhoids are painless in the absence of thrombosis or infection, and some patients may have difficulty in defecation. 3. 3. mixed hemorrhoids, manifested as internal hemorrhoids and external hemorrhoids symptoms can appear at the same time. Internal hemorrhoids develop to degree III or above, and mixed hemorrhoids are often formed. Mixed hemorrhoids gradually aggravated, was ring-like out of the anus, out of the hemorrhoids in the perianal was plum blossom-shaped, known as ring-like hemorrhoids. If the hemorrhoids are spasmodic sphincter pressure, so that edema, bruising, thrombosis or even necrosis, clinically known as incarcerated hemorrhoids or strangulated hemorrhoids. To sum up: hemorrhoids can be manifested as:1 anal bleeding during bowel movement, which can be dripping blood, or even jet-like bleeding.2 anal prolapse of swelling or perianal swelling.3 can be accompanied by pain, when thrombus is formed within the hemorrhoids, embedded and inflammation can occur pain.