There may be the following causes of pain in the elbow joint: 1. The most common cause of pain in the elbow joint is strain or excessive exercise. Lifting heavy objects, holding heavy objects for too long or exercising too much may cause a transient injury or inflammation of the tendons or fascia of the elbow joint, resulting in localized pain. The pain in this case has a clear cause, and the pain does not last too long, and can be cured without treatment or with simple treatment, and the pain usually lasts no more than 3 days. 2. If the pain occurs on both sides of the elbow joint or on one side, it may be caused by humeral condylitis. The humeral condyle is divided into the humeral epicondyle and the humeral medial epicondyle, both of which are attachment points for tendons, and excessive forearm rotation and wrist movement can cause humeral condylitis. Tennis players and golfers, or housewives with heavy workloads, are most likely to develop humeral condylitis.