Venous insufficiency is a condition whereby the walls and valves in the veins do not work properly, so the blood does not flow normally through the circulatory system to the heart. When this happens, blood tends to pool in various areas in the veins – most obviously in the legs – and this can cause swelling and varicose veins. Whereas arteries carry oxygen-rich blood from the heart to the tissues and organs throughout the body, veins carry the oxygen-depleted blood back to the heart for ... [Read More]