Varicose veins are enlarged and swollen veins. They can occur anywhere in the body, but are particularly common in the surface veins in the legs.

Varicose Veins
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Veins have one way valves to channel blood back to the heart. Varicose veins develop when the valves of the veins become damaged. This causes blood to pool in the veins, enlarging them and often making the veins just beneath the skin visible.