Swelling from the ankles, feet, or legs is usually attributable to fluid buildup, also known as oedema. This happens when excess fluid leaks from blood vessels and accumulates within the surrounding tissues. Some frequent causes of swollen ankles and feet include: Varicose veins are a standard indicator of venous insufficiency. https://www.sgvascularctr.com/swollen-leg-why-do-i-have-it-and-what-can-i-do/