Tennis elbow is generally referred to as epicondylitis of the humerus and is caused by a chronic tearing injury caused by repetitive force on the extensor muscles of the forearm. Patients may experience pain in the affected area when gripping or lifting objects with force. Epicondylitis of the humerus is usually managed with surgical and non-surgical treatments. Surgical treatment is used for patients with severe epicondylitis of the humerus, and can be minimally invasive, such as arthroscopy, to remove unhealthy tissues and re-improve blood circulation, and is used for patients whose pain affects their quality of life. Non-surgical treatments are used for patients with mild cases of epicondylitis of the humerus. Patients are generally advised to rest, ice, wear a brace on the forearm, and relieve pain by taking non-steroidal anti-inflammatory painkillers such as diclofenac as prescribed by their doctor, and to perform recovery exercises as prescribed by their doctor. If the pain is severe, cortisone can be used for localized closure. Epicondylitis of the humerus is usually handled with surgical and non-surgical treatments, and patients are advised not to use medication or exercise on their own, and activities that cause pain, such as playing tennis, are strictly prohibited during the period of illness. Patients should go to the hospital for a systematic examination and follow the doctor’s instructions for the systematic treatment of epicondylitis of the humerus.