Pain in the medial elbow joint may be caused by the following.1. It may be medial humeral epicondylitis. Usually the main pressure point for this condition is in the medial humeral epicondyle. If the local aseptic inflammation is strong, there will also be redness, swelling, heat and pain such as local skin flushing and increased skin temperature. The medial epicondyle of the humerus is mainly the stop of the forearm palmaris muscle group, the fingers or wrist bending hard to hold heavy things, or doing strenuous exercise, it is easy to cause the muscle and the stop to be pulled frequently, and cause chronic aseptic inflammation and pain in this place.2. It may be caused by injury, such as local contusion or frequent pressure, accidental strain during exercise, which can cause pain. Usually there will be obvious ecchymosis or swelling and pain.