Although the saying “nine out of ten hemorrhoids” is somewhat exaggerated, the high incidence of hemorrhoids is recognized, so why is it so easy to develop hemorrhoids? It is generally believed to be the result of a combination of factors. Hemorrhoids occur due to the dilation of blood vessels, which used to be called varicose veins, and also due to problems with the tissues that hold these vessels in place, such as aging, decreased elasticity or fracture, which is now generally accepted in the medical community as the doctrine of inferior displacement of the anal cushion. The degree of dilatation of the blood vessels determines the size of the hemorrhoid, and problems with the fixed tissues can lead to prolapse. So anything that can cause changes in both of these areas is the cause of hemorrhoids. The development of hemorrhoids has a great deal to do with its own local peculiarities of the anus: 1. The vascular structure is special: the rectal venous plexus has no venous valves, and the blood reflux power decreases; the tissue of the submucosa of the rectum is loose, and the resistance around the walls of the hemorrhoid vessels is weak, and they expand easily when the internal pressure increases; the vessels cross the rich muscle groups of the perianal area, and the reflux is easily obstructed. 2, the anal location is special: people are different from reptiles, is the upright position, the anus is located in the lowermost part of the abdominal cavity, the role of gravity by the largest, the blood reflux burden. 3, the anal function is special: undertake the task of excretion of feces, every day to be subject to friction, squeeze and various bacterial stimulation, easy to lead to hemorrhoid nucleus prolapse and vascular inflammation. These factors constitute the basic conditions for the high incidence of hemorrhoids, and will develop once the external factors are sufficient. External factors (more factors in this area): 1, bad body position, high fatigue: sedentary, standing, squatting, walking for a long time. 2, poor dietary habits: over-eating fat, sweet and thick, spicy and stimulating products. 3, bad bowel habits: squatting too often, for too long. 4, abnormal stool: long diarrhea, long-term constipation. 5, the impact of disease: lower abdominal tumors, hypertension, cirrhosis, anorectal chronic inflammation. 6, other: excessive impure sexual life, women’s pregnancy. These causes independently or in combination cause the disease, of which bad bowel habits and anal impurity is the most important. The current hemorrhoid is a high incidence, common disease, the symptoms must be promptly to the hospital for early treatment, to prevent the prolonged days, become other diseases.