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Chronic venous insufficiency (CVI) is a condition where blood doesn't efficiently return from the legs to the heart, often due to damaged valves in the veins. This can lead to a range of symptoms, including swelling, pain, and skin changes, and in severe cases, ulcers. While not usually life-threatening, CVI can significantly impact quality of life and, if left untreated, may lead to complications like deep vein thrombosis or pulmonary embolism.