Venous reflux disease, also known as venous insufficiency, is a medical condition affecting the circulation of blood in the lower extremities. The tiny valves that normally force blood back up towards the heart no longer function, causing blood to pool up in the legs, and the veins of the legs become distended.
Venous reflux disease commonly produces varicose veins, the abnormally swollen and discolored superficial leg veins that affect more than 25 million Americans. varicose veins can range from small, thin purple lines just under the skin (known as "spider veins") to thick, bulging veins that can protrude well beyond the skin surface. In any form, varicose veins serve as indicators of venous reflux, a progressive disease that can cause significant circulatory problems as it worsens.