The most common causes of tennis elbow pain are overuse of forearm muscles, trauma, etc. If the pain symptoms persist, it is recommended to seek medical treatment in time. 1. Excessive use of forearm muscles: tennis elbow is also known as epicondylitis of the humerus, the most common cause is repeated twisting of the arm, resulting in excessive use of the forearm muscles, which in turn induces inflammation, which is common in people who have a lot of arm activity, such as carpenters, tennis players, etc., and when inflammation occurs, it will cause pain in the elbow joint. 2. Trauma: the patient suffers from external impact or elbow knocked to the ground, may lead to humeral epicondylar injury, which in turn causes humeral epicondylitis, resulting in elbow joint pain. If the symptoms of tennis elbow patients joint pain aggravation, should be timely to the hospital for examination, by the doctor targeted treatment, usually pay attention to the protection of the elbow joint, stop the activities that lead to pain.