why does someone feet swell
Swelling is caused by fluid buildup in the tissues. Gravity pulls the fluids to your feet and ankles, causing them to swell. Swelling can be caused by a serious condition of the kidney, heart, liver or blood vessels. Some other causes of swelling are: 1  Eating a poor diet high in salt and carbohydrates. 2  Taking birth control or hormone replacement therapy pills. 3  Pregnancy. 4  PMS.