The venous system in the legs consists of veins that carry blood back to the heart after it has circulated through the body. When these veins do not function properly, blood can pool in the legs, leading to conditions such as varicose veins, chronic venous insufficiency, swelling, skin changes, and leg discomfort. Common symptoms may include aching, heaviness, cramping, or visible enlarged veins. Early evaluation and treatment can help improve circulation, relieve symptoms, and prevent potential complications while supporting long-term leg health.