Reasons for ankle and foot swelling include being overweight, taking certain medications and long periods of standing, according to Healthline. Preeclampsia, foot or ankle injury, and lymphedema are also causes, states WebMD.
Swelling of the feet and ankles is known as peripheral edema, meaning accumulation of fluid in those areas. Treatment for the swelling involves elevating the legs above the heart when possible, reducing salt intake, wear loose-fitting clothes, using support stockings and maintaining a healthy weight, advises Healthline. If other symptoms, such as fluid in the abdomen, fatigue, appetite loss or weight gain, accompany foot and ankle swelling, medical attention is necessary, states WebMD.