What Causes Varicose Veins
One-way valves in the veins direct blood flow towards the heart. Blood can gather in the veins if the valves become weaker or broken. The veins enlarge as a result of this. When one of these valves fails, blood can pool in the vein, causing the vein to stretch and twist, resulting in a varicose vein. It’s not always clear what causes the valve to malfunction, and there’s no way to prevent it from happening.
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