Every time I mention hemorrhoids, I always think of the surgery class more than 10 years ago. The old professor of Surgery said in his deep and powerful voice: "students, hemorrhoids is the most common disease in our department. As the saying goes, ten men and nine hemorrhoids..." at that time, the girls in the class laughed. The old professor said: "female students don't laugh, there is another sentence behind it, it's ten women and ten hemorrhoids..." then the male students laughed and coaxed, and the girls shyly lowered their heads.
Many people think that hemorrhoids are diseases, which is actually wrong. At present, Thomson's theory of downward displacement of anal pad is widely accepted. This theory holds that hemorrhoids are a normal physiological structure, namely vascular pad. It is located under the lower rectal mucosa and anal skin, and is mainly composed of venous vessels and some connective tissue. It is an erectile tissue. Generally, the venous vessels maintain a certain degree of congestion and cushion function, increase the sealing performance when the anus is closed, and do not make the feces flow out. Hemorrhoids is a pathological state caused by the downward movement of hemorrhoid tissue and excessive varicose veins. In other words, hemorrhoids are normal, hemorrhoids are sick.
First of all, this is closely related to the evolution of human beings. The essential difference between human beings and apes is that human beings move from the tree to the tree, from crawling to walking upright. In the process of walking, our anus is at the bottom. Because of gravity, it is difficult for the blood in the anus to return to the heart. In addition, there is no venous valve in the rectal vein to prevent the backflow of blood, so the blood is easy to accumulate over time, Excessive varicose veins.