Copyright © Nucleus Medical Media, Inc. Chronic venous
insufficiency is caused by higher-than-normal blood pressure
within the leg veins. Chronic venous insufficiency can be caused
by blood clots or swelling and inflammation of the veins
calledphlebitis. Blood clots in the legs, called deep vein
thrombosis , can damage the valves in the veins. When people get
chronic venous insufficiency after a blood clot, it may be
referred to as post-thrombotic syndrome. When it occurs after
phlebitis, it may be referred to as post-phlebitic syndrome.
Other causes of chronic venous insufficiency include: - Absence
or weakness of valves in the leg veins that is inherited at
birth - Increased venous pressure in the legs for any reason -
Varicose veins Risk factors that increase your chance of getting
chronic venous insufficiency include: When blood pools in the
legs, it puts pressure on the veins. Sometimes, the blood leaks
out into the tissues. This can discolor and damage the skin. It
may even cause skin ulcers. Symptoms o