Chronic venous insufficiency (CVI) is a condition where the veins in the legs struggle to send blood back to the heart. This occurs when the valves in the veins become weak or damaged, leading to blood pooling in the legs. Symptoms may include swelling, pain, and skin changes, which can affect daily activities. CVI can be caused by factors such as age, obesity, and a history of deep vein thrombosis. Treatment options include lifestyle changes, compression stockings, and in some cases, medical procedures to improve blood flow. Early diagnosis and management are important to prevent complications.