Abnormal accumulation of excess fluid in the tissues of the body.
Edema occurs when fluid moves out of blood vessels and accumulates in surrounding tissues. It commonly causes swelling, particularly in the legs, ankles, feet, hands, or around the eyes, although it can occur almost anywhere.
Causes include prolonged standing, injury, certain medications, venous problems, heart failure, kidney disease, liver disease, low blood protein levels, and inflammation. Edema may affect a small area or become widespread.
QUICK FACT
Edema is a sign, not a single disease. Its significance depends heavily on where it occurs and what caused it.
COMMONLY CONFUSED WITH
- Inflammation: can cause edema, but edema can occur without inflammation.
- Lymphedema: a specific type of swelling caused by impaired lymphatic drainage.
SEE ALSO