This is a painful inflammation due to tear-injury of the tendon at the outer edge of the elbow, caused by overuse of the forearm muscles. It is very common among tennis players and those who work with their hands in repetitive tasks - including people who frequently use computers or hand-held games. Tennis elbow which involves damage to just the tendons of that joint is a form of tendinitis. Pain from this may radiate down the outside of the arm. If the muscles or bones of the elbow are involved, it is called lateral epicondylitis; and if the elbow's bursa, or lubricating sac, is inflamed, you have bursitis, producing pain on the back of the elbow. Healing of tendons is slow due to poor blood supply and may take many weeks.