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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.
Fluid in lungs or pulmonary edema means that there is abnormal or unwanted fluids in your lungs. Edema means swelling or inflammation happens when the fluids from your blood vessels come out and spread in the surrounding tissues, mostly alveoli (tiny air sacs where the passing blood picks up oxygen from the air).