Several everyday factors can contribute to swollen feet. Sitting still during long flights or car journeys can allow fluid to pool in the lower legs, while hot weather causes blood vessels to widen. Eating foods high in sodium can also make the body retain additional water, and injuries such as ankle sprains commonly cause localized swelling, pain, and tenderness.
However, persistent or unexplained swelling can sometimes indicate a more serious health problem. Conditions affecting the heart, kidneys, or liver can interfere with the body’s ability to regulate fluid. Swelling that is significantly worse in one leg—especially with pain, redness, or warmth—can also be associated with deep vein thrombosis, a potentially dangerous blood clot.
Occasional mild swelling may improve by elevating the feet, taking regular walking breaks, moving the ankles during prolonged sitting, staying hydrated, and reducing excess sodium. But new or worsening swelling should not be ignored, particularly if it occurs with chest pain, shortness of breath, severe weakness, fever, or significant tenderness. In those situations, prompt medical attention may be necessary.
