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Edema. Edema or oedema, formerly known as dropsy or hydropsy, is an abnormal accumulation of fluid in the interstitium, which are locations beneath the skin or in one or more cavities of the body. It is clinically shown as swelling.dema or oedema, formerly known as dropsy or hydropsy, is an abnormal accumulation of fluid in the interstitium, which are locations beneath the skin or in one or more cavities of the body.
Edema: The abnormal retention of fluid in a given anatomical area. See detailed information below for a list of 208 causes of Edema, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Edema: Causes | Symptom Checker Â».