The causes of elbow pain when clenching fists may be ligament injury, epicondylitis and synovitis. 1. Ligament injury: due to less sports activities, occasional labor or strenuous exercise, such as snow removal, tennis, etc., resulting in ligament injury of the elbow joint, elbow pain will occur when clenching the fist. 2. Epicondylitis: Repeated over-activity of the wrist over a long period of time causes inflammation at the epicondyle of the humerus and elbow pain when clenching the fist. 3. Elbow synovitis: due to the patient’s immunity is relatively low, or joint trauma and other reasons, resulting in synovial stimulation of inflammation, will also appear clenched fist elbow pain. Clenched fist elbow pain may have other reasons, if the pain is not obvious by rest, should be timely to the regular hospital, by the doctor according to the symptoms, signs and auxiliary examination to determine the specific cause.