Inflammation of a tendon, the fibrous tissue that connects muscle to bone, causing pain, tenderness, and sometimes swelling near joints. It commonly results from overuse, repetitive motions, or sudden injury.
From Latin 'tendo' meaning 'to stretch' (referring to tendons) and Greek '-itis' meaning 'inflammation.' The term became standard in medical literature during the 19th century as sports medicine and occupational injuries gained recognition.
Tennis elbow affects more non-tennis players than actual tennis players - it's caused by any repetitive gripping motion, from typing to gardening. The pain comes from tiny tears in the tendon that attaches forearm muscles to the elbow bone.
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