Causes of Varicose Veins | Naples Heart and Vein.

Varicose veins are caused by the failure of the vein valves to force blood back to the heart. This failure allows the blood to pool in the lower legs and feet (typically), which causes the bulging, twisted and painful varicose veins. To truly understand the full scope of the varicose vein cause it is important to understand what the veins do, their purpose in our body and how they work.