Tennis elbow, or lateral epicondylitis, is a condition characterized by pain and tenderness at the lateral epicondyle of the elbow, primarily affecting individuals engaged in repetitive wrist motions, with 95% of cases occurring in non-tennis players. Diagnosis is typically clinical, utilizing tests like Cozen's, Mill's, and Maudsley's tests, while management revolves around conservative treatments, with most cases resolving spontaneously within 6-12 months. For persistent cases, operative options such as open debridement or injections may be considered.