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Veins or thin-walled vessels carry impure blood back to the heart. Veins act as one-way valve that prevents impure blood from flowing backwards. When these valves become weak, the blood flows back to the veins and results in congestion due to clots of blood. With the congestion the veins becomes enlarged and this condition is known as varicose veins.
Alien writes for Diabetes blog . He also writes for best cosmetics and skin diseases
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