Also known as lateral epicondylitis. Caused often by playing excessive tennis however is caused by the shock absorbed by the elbow and can therefore happen in many other sports. It is caused by inflammation and of one or several of the forearm muscles usually 2cm below the outer edge of the elbow.
Pain on the outside of the elbow
Pain when the hand is bent back
Weakness in the wrist
Pain when palpating over the lateral epicondyle (outside of the elbow)