Cause of hemorrhoids: reduction of anal pad:
Hemorrhoids is the result of the degeneration of anal canal supporting tissue leading to the reduction of specific mucosa and submucosal tissue. The mucosal sliding theory was proposed for the first time. Since then, parks and Thomson further developed this point and put forward the "buffer theory" under the anal mucosa. Anal cushion is composed of dilated veins, smooth muscle, collagen fibers and elastic connective tissue, which can adapt the anal mucosa to the changes of the size of the Yangtze River. Moreover, it plays an important role in anal atresia and maintaining anal self-control. Degenerative changes of connective tissue, excessive force during defecation, resulting in anal pad falling off and hemorrhoid symptoms. Anal pad sagging, hemorrhoid venous reflux blocked, hemorrhoid congestion, edema and anal pad congestion are not only affected by anal pressure such as constipation and pregnancy, but also related to hormones, biochemical factors and emotions.
Cause of hemorrhoids: angiogenesis:
The submucosal tissue is very thick. Bourgery calls it "erectile web (Henrich) 1980". It is the rectal cavernous body, which is composed of a large number of blood vessels, smooth muscle, elastic fibers and connective tissue. Like the air cushion of the rotor, when the sphincter contracts.
Cause of hemorrhoids: anal stenosis:
According to the theory of anal stenosis, brnes, mile, slack and other local sphincters have not been fully relieved, increasing abdominal pressure, promoting defecation, leading to hemorrhoids, venous congestion, internal hemorrhoids, increasing the shear force on the anus, resulting in a decrease. The theoretical basis of anal dilation therapy is the theory of anal stenosis, which has achieved certain therapeutic effects in clinic, but this theory can not explain all the problems of hemorrhoids.
Causes of hemorrhoids: vascular diseases:
It is reported that venous dilatation and obstruction of venous blood reflux are the causes of hemorrhoids. Therefore, various factors that increase intravenous pressure (such as increased intra-abdominal pressure, upright position or vascular wall injury) are related to the occurrence of hemorrhoids.
Factors causing hemorrhoids: Causes
The cause of hemorrhoids is not completely clear. It may be caused by many factors. At present, there are the following theories.
Factors causing hemorrhoids:
1. The vein said angrily to Zhang
This theory was originally proposed by Hippocrates. Hemorrhoids are filled with dilated veins. It is claimed that hemorrhoids are caused by rectal and anal submucosal varices. This theory was first in an orthodox and important position. Therefore, the theoretical basis supporting this theory is recognized as an important reason for constipation, suffocation during defecation, frequent hemorrhoids and bloody stool, and long-term formation of hemorrhoids. Strong cessation of dry and hard excreta and breathing can prevent hemorrhoid venous reflux and sometimes dilation. Recent studies by many scholars have shown that hemorrhoids venous dilatation has always existed from newborns to healthy adults, which is a normal tissue structure. Therefore, this theory can not explain the essence of hemorrhoids.
The main causes of hemorrhoids: 2. Increased pressure on the anal pad
Anal pad is the tissue pad of anal canal and rectum, referred to as "anal pad" for short. It is an anatomical phenomenon that has existed since birth. Anal pad is composed of three parts.
They are called veins or venous sinuses.
The smooth muscle between Treitz muscle, anal lining and anal sphincter plays a role in fixing the anal pad. Usually, the anal pad will be sparsely attached to the muscle wall and contract to the anal canal through its own fiber contraction after defecation.
Anal pad pressure measurement showed that the basal pressure of patients with internal hemorrhoids was significantly higher than that of the control group. The increase of basal pressure was related to the increase of vascular pad pressure, in which the increase of sphincter activity would increase anal pressure and form internal hemorrhoids. Sun (1990) confirmed that the increase of anal resistance in patients with hemorrhoids is related to the congestion of hemorrhoids itself. Anal muscle tone does not increase. Confirm that the treatment of reducing vascular segments by injection, clamping, electrocoagulation or surgical resection is correct
The above theory can not fully explain the occurrence of hemorrhoids, so the occurrence of hemorrhoids may be the result of the comprehensive action of many factors, and hemorrhoids may also have diversity in Genesis. (William Shakespeare, hemorrhoids, hemorrhoids, hemorrhoids, hemorrhoids, hemorrhoids, hemorrhoids.)
Factors causing hemorrhoids: etiology
Factors causing hemorrhoids: pathology
Hemorrhoids are cereal vein segments that protrude from the bottom of the rectum and the surface of the anal canal and cover the mucosa. The protruding part is also called hemorrhoids. The surface is dark red or purplish red. It is spongy tissue, which is closely connected with the anal sphincter. Inside, there are curved arterioles and thin veins on the wall of the granary. The dilated veins form thrombus and form thrombus.
Factors causing hemorrhoids: Classification
Generally, hemorrhoids are divided into three categories with the tooth line as the boundary.
(1) Hemorrhoids are located above the dental line, the surface is covered with mucosa, and the internal veins of internal hemorrhoids are dilated. It is common in the left, right front and right rear of the workplace. From the beginning, hemorrhoids will protrude to the Yangtze River. Over time, they will protrude outside the anus, showing bloody stool and sagging. According to the clinical symptoms of hemorrhoids, they can be divided into non detachable internal hemorrhoids, internal hemorrhoid flight and internal hemorrhoid diseases. Internal hemorrhoid flight is also known as circular hemorrhoids.
(external hemorrhoids) located below the dental line, the surface is covered with skin and formed in the external venous plexus of hemorrhoids. It can be divided into thrombotic exocrine substance, connective tissue exocrine substance (skin vertical), varicose exocrine substance and inflammatory exocrine substance.
(3) The boundary tissue of skin and mucosa is covered near the tooth line of internal hemorrhoids and external hemorrhoids). The internal veins of hemorrhoids and external veins of hemorrhoids are anastomosed with each other. The interoperable veins have the characteristics of internal hemorrhoids and external hemorrhoids.