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What are Varicose Veins and Spider Veins and What Causes Them?

Varicose veins are dilated veins near the surface of the skin that occur secondary to weakened valves and veins in your legs. In veins, there are one-way valves that keep blood flowing from your legs back up to your heart. When the valves are not functioning properly, blood collects in the veins in your legs […]