What Is Chronic Venous Insufficiency?
Chronic venous insufficiency (CVI) is an advanced type of vein disease that develops when the valves inside your leg veins weaken enough that they can no longer move blood upward efficiently. The ongoing pressure can cause discomfort in the legs if not treated. Varicose veins and spider veins are signs that the venous system is not functioning as efficiently, but not everyone with these visible veins will go on to develop CVI. About 1 in 50 people who have varicose veins will eventually have CVI as well, a risk that increases with age.