Fluid build up, also known as EDEMA, is a medical condition in which an excessive amount of fluid accumulates in the body's tissues. It can be caused by a variety of factors, including heart failure, kidney disease, and certain medications. EDEMA can cause swelling in the hands, feet, ankles, and other areas of the body. Treatment for EDEMA typically involves lifestyle changes, such as reducing salt intake and increasing physical activity, as well as medications to reduce fluid retention.