There are several reasons for varicose veins of lower limbs. (1) Weak vein wall: Congenital hypoplasia of vein wall, uneven thickness of vein wall, relatively weak vein wall, which can expand under the action of venous pressure. The expansion of valve sinus leads to the imperfect closure of the original venous valve, which leads to the relative insufficiency of the valve, blood reflux and long-term accumulation, and finally leads to varicose veins. (2) Venous valve dysplasia: Congenital venous valve dysplasia is too lacking, which can not effectively prevent blood from returning, and the blood pressure in the vein increases, which makes the vein wall easy to expand and varicose veins appear for a long time. (3) Continuous increase of venous pressure: venous blood itself exerts a certain pressure on the valve due to gravity, but when venous pressure continues to increase, the valve will bear too much pressure, but when venous pressure continues to increase, the valve will bear too much pressure, and the valve will gradually relax, prolapse and gradually close incompletely, which will affect the venous blood return and cause varicose veins. This is more common in patients with long-term standing work, heavy physical labor, chronic cough, pelvic tumor and long-term constipation.
Why do humans suffer from varicose veins of lower limbs?
Humans are the only mammals that walk upright for a long time. Walking upright and working are obvious differences between humans and animals. For defying gravity's gravity, venous blood will flow back to the heart. In the congenital anatomical structure, nine valves are needed to prevent blood from flowing backwards and block the downward flow of blood. In addition, the calf muscles will contract and relax with the movement of God, pushing the blood upward like a "pump" to prevent the blood from concentrating on the lower limbs. When there is a problem with the valve or muscle, it will cause venous hypertension of lower limbs, which is easy to cause varicose veins. Therefore, varicose veins of lower limbs are a unique disease of human beings, and it is also described as an evolutionary disease of human beings from crawling to walking upright.
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