Is tennis elbow caused by playing tennis? After examination, the doctor told the patient that “you have tennis elbow”, but the patient was puzzled and asked “no way, I have never played tennis in my life”. The full medical name of tennis elbow is medial epicondylitis or epicondylitis of the humerus, because tennis players have more elbow flexion and extension activities and are more prone to develop tennis elbow. The medial epicondyle is the main starting point of the forearm flexor muscle, and the lateral epicondyle is the main starting point of the forearm extensor muscle, and these muscles contract with each other to complete the flexion and extension of the elbow joint. When people repeatedly flex and extend the elbow joint with more force than they can tolerate, especially in some middle-aged and elderly people with liver and kidney deficiencies, the tendon fibers degenerate and age, causing different degrees of tears at the starting point of the medial epicondyle and lateral epicondyle muscles, causing bleeding, edema, adhesions and other sterile inflammatory changes, stimulating the peripheral nerves, causing pain and tennis elbow. Tennis elbow can be caused by excessive tennis activity, but in fact, people who frequently move their elbow joints with great force may get the disease. The incidence of tennis elbow is higher among plasterers, hairdressers, computer workers, vegetable planting, rice planting, manual laundry and pole surface activities. Some people do not have a lot of elbow joint activities, but local trauma, or feel the wind and cold can also cause this disease. The majority of patients are middle-aged and elderly, and more men than women. The pain usually occurs near the medial epicondyle and a few near the lateral epicondyle, and is often accompanied by forearm pain, which increases when the elbow is flexed or rotated. The pain is often accompanied by forearm pain, which is aggravated when the elbow is flexed or rotated. After tennis elbow, the affected limb should rest properly and avoid excessive activities. The most common treatment method is closure, in addition, plasters, medication fumigation, physical therapy and small acupuncture treatment are also available. After healing, it is still important to prevent the elbow joint from feeling wind and cold to avoid recurrence.