DefinitionVenous insufficiency is a condition in which the veins have problems sending blood from the legs back to the heart.See also:Deep venous thrombosisStasis dermatitis and ulcersVaricose veinsAlternative NamesChronic venous insufficiencyCauses, incidence, and risk factorsVenous insufficiency is caused by problems in one or more deeper leg veins. Normally, valves in your veins keep your blood flowing back towards the heart so it does not collect in one place. But the valves in varicose veins are either damaged or missing. This causes the veins to remain filled with blood, especially when you are standing.The condition may also be caused by a blockage in a vein from a clot (deep vein thrombosis).Chronic venous insufficiency is a long-term condition. It occurs because of partial vein bl