Chronic venous insufficiency is a condition in which the veins in the legs don't work as they should. The veins are designed with valves which work similar to the valves that you would see in a pipe or elsewhere.
Just as a valve in a pipe should allow water to flow in one direction, the valves that are placed in your legs also should only allow blood to flow in one direction.
However, patients with chronic venous insufficiency find that blood is also flowing back ways, so what happens is that excess blood collects in the legs.
This causes discomfort and even pain. However, it is not regarded as a life-threatening condition.
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