Tennis elbow, clinically called epicondylitis of the humerus, generally has a good prognosis, but is prone to recurrence if daily protection is not strengthened. Epicondylitis of the humerus is a chronic injurious aseptic inflammation, mostly caused by long-term and repeated forceful activities of the wrist, often manifested as pain on the outer side of the elbow joint and weakening of the grip strength of the hand. Tennis players, badminton players and other high prevalence. Because the elbow is used many times in daily life, once you have tennis elbow and it is not completely cured, it is easy to have recurrent attacks when the elbow is subjected to excessive strain or fatigue. Restricting fist-clenching and wrist-extension movements is the principle of preventing the recurrence of tennis elbow. Protection should be provided in daily life, and elbow pads should be worn when necessary to avoid excessive strain on the elbow. If tennis elbow is diagnosed, early and standardized treatment is recommended to reduce the recurrence of the disease.