What Causes Varicose Veins? The specific cause of varicose veins National Heart, Lung, and Blood Institute What Causes Varicose Veins? the specific cause for varicose veins What Causes Varicose Veins? What Causes Varicose Veins? What Causes Varicose Veins? Varicose veins are cause by the specific cause for varicose veins What Causes Varicose Veins? What Causes Varicose Veins?