When veins no longer function properly, the condition is known as venous insufficiency. Here, the one-way valves become weak and gravity causes “reflux” or backward flow of the blood. This causes the veins in the lower extremities to become thickened and tough, often visible and painful. These dysfunctional veins are called varicose veins.
People with the following risk factors may be more likely to develop venous insufficiency.
www.vdf.org/diseaseinfo/cvi
www.sirweb.org/patients/varicose-veins/
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