text: Edema is an observable swelling from fluid accumulation in certain body tissues. Edema most commonly occurs in the feet and legs, where it also is referred to as peripheral edema. The swelling is the result of the accumulation of excess fluid under the skin in the spaces within the tissues that are outside of the blood vessels.\n\nHeart failure often causes edema. Congestive heart failure or CHF is the bunch of symptoms that hit you when your heart can't pump enough blood to satisfy your body's needs.