'Golfer's elbow', or ''medial epicondylitis'', is an inflammatory condition of the Medial epicondyle of the humerus of the elbow. It is in some ways similar to tennis elbow. The anterior forearm contains several muscles that are involved with flexing the fingers and thumb, and flexing and pronating the wrist. The tendons of these muscle come together in a common tendinous sheath, which is inserted into the medial epicondyle of the humerus at the elbow joint. In response to minor injury, or sometimes for no obvious reason at all, this point of insertion becomes inflamed.