Chronic vein disease is a common disorder that occurs when the veins in the lower legs no longer work efficiently. The veins have one-way valves that help blood flow against gravity to the heart. When the pumps stop working efficiently, the blood can flow backwards and pool in the lower legs and ankles. The pooled blood can increase pressure and cause symptoms and more severe damage to the affected vein. This condition is called venous insufficiency. Vein Health Clinics manages venous disease.