Varicose veins are primarily tortuous and dilated superficial veins in the lower extremities due to increased pressure. To understand the causes of varicose veins you need to first understand the anatomy of the blood vessels in the legs. The blood vessels in the human body are divided into arteries and veins. The role of arteries is to transport the blood pumped by the beating heart to the extremities, internal organs, brain and other tissues, and after the tissues absorb the nutrients in the blood, the metabolites are transported back to the heart through the veins, so the blood in the veins of the legs flows upward from the feet. The veins in our legs can be divided into deep veins and superficial veins, with deep veins accounting for about 90% of the blood returned and superficial veins accounting for about 10%. When we talk about varicose veins, we mean superficial varicose veins. The superficial veins in the legs are mainly the great saphenous vein and the small saphenous vein, and the varicose veins of the great saphenous vein and its branches are the main ones, and a small part of them are accompanied by or simply have small saphenous varicose veins. The blood flow in the veins of the lower extremities is relatively slow, and when we stand up the venous reflux also needs to overcome the effect of gravity, so two important conditions are needed to ensure the smooth reflux of venous blood, one is the contraction of the calf muscles and the other is the action of the venous valves. When the calf muscle contraction can squeeze the blood vessels, so that the blood flows upward, while the venous valve is equivalent to a one-way valve, which can prevent the venous blood from flowing downward again. Long-term standing work, heavy laborers, because the valve is continuously subjected to the pressure of blood backflow, over time the venous valve will be damaged, venous blood backflow, resulting in increased venous pressure, superficial veins around the fat and skin-based, the lack of muscle restraint, the blood vessels will compensate for the thickening, the thickening of blood vessels to further aggravate the valve closure is incomplete, the blood vessels further thickening, growth, resulting in varicose veins. Varicose veins are a slow development process, with time delayed symptoms gradually aggravated, most of them develop faster in middle and old age, but some patients develop to a certain extent and no longer aggravated, or after treatment with drugs, elastic stockings, etc. can slow down the development or even reduce the symptoms.