Swelling during the ankles, feet, or legs is commonly a result of fluid buildup, also referred to as oedema. This happens when excessive fluid leaks from blood vessels and accumulates from the bordering tissues. Some common causes of swollen ankles and feet consist of: Warm climate may cause heat edema. https://www.sgvascularctr.com/swollen-leg-why-do-i-have-it-and-what-can-i-do/