DefinitionPainless swelling of the feet and ankles is a common problem, particularly among older people.Abnormal buildup of fluid in the ankles, feet, and legs is called peripheral edema.Alternative NamesSwelling of the ankles - feet - legs; Ankle swelling; Foot swelling; Leg swelling; Edema - peripheral; Peripheral edemaConsiderationsPainless swelling may affect both legs and may include the calves or even the thighs. Because of the effect of gravity, swelling is particularly noticeable in the lower part of the body.Common CausesFoot, leg, and ankle swelling is common with the following situations:Prolonged standingLong airplane flights or automobile ridesMenstrual periods (for some women)Pregnancy -- excessive swelling may be a sign of preeclampsia, a serious condition sometimes called t