Serious venous insufficiency. Leg swelling (oedema / drinking water retention) connected to chronic venous insufficiency is very common. It accounts for 90% of your situations of leg swelling. It is often found in sufferers with very long-standing varicose veins, prior heritage of deep vein thrombosis and iliac (pelvis) vein compression. https://sgvasculargrp.com/medical-condition/lymphoedema/