Chronic Venous Insufficiency (CVI) A condition caused by faulty valves that allow blood to pool in the leg veins, which can result in painful symptoms. These symptoms include fatigue or weakness, leg pain, restless leg, itching, burning, skin pigmentation from mild to severe and venous ulcers on the legs. This is diagnosed by ultrasound and very effectively treated by; ablation for the superficial venous system and stenting for the deep venous system.