Vein valves play a critical role in helping blood flow through the veins back to the heart. Like swinging doors, valves open to allow blood to flow toward the heart and flap closed again to prevent the flow of blood back down the legs. If the veins become dilated, the flap-like valves cannot completely close, making them incapable of preventing the back flow of blood. This ‘back flow’ of blood through dysfunctional valves is called venous reflux or venous insufficiency.
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