What is the difference between edema and effusion?

National Athletic Trainers' Association

Edema is swelling that occurs outside a joint. Effusion is swelling within a joint.

(This answer provided for NATA by the Gustavus Adolphus College Athletic Training Education Program.)

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.

Bone & Joint Conditions

Your bones are your body's framework. It's assembled with bones that are constantly rebuilding and joints that allow you to move. It's an intricate system affected by your metabolism, nutrition, medications, wear-and-tear and medical problems like diabetes and high blood pressure. Among bone and joint problems are osteoporosis (brittle bones), osteoarthritis (degenerative arthritis) and gout. Prevention is always optimal, but when problems occur, treatment might involve weight-bearing exercise, dietary changes, exercise, medical treatments and possibly surgery.

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What is the difference between edema and effusion?

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