The term “tennis elbow” has been implanted in people’s minds for a long time, and it does not sound unfamiliar. Even doctors are not used to the scientific name “humeral epicondylitis”. The cause is a sterile inflammation of the common tendon of the forearm extensor at the point of attachment of the humeral epicondyle. There are other theories, such as microneurovascular bundle compression, local tension theory, etc., but it is recognized that this disease can be caused by acute or chronic injury. Acute injuries are commonly caused by arm wrestling, heavy lifting, etc. Chronic injuries are often related to the nature of the occupation, such as cooks, cleaners (including housewives), repairmen, badminton, table tennis or tennis players, etc. Treatment methods such as drugs, closure, acupuncture, Chinese medicine, manipulation, etc.. However, some conditions are stubborn, mainly due to the failure to stop the causative factors. In severe cases, osteoarthritis develops, leading to increased pain and impaired elbow flexion and extension. However, not all pain in the lateral elbow joint is tennis elbow, such as strain of the brachioradialis joint, rotator anterioris roundus syndrome, and rotator posterioris syndrome, which are similar but belong to different diseases. It needs to be diagnosed and treated differently by the doctor during physical examination.