The term "tennis elbow" has been used in the medical literature for over 100 years to describe a variety of conditions on the lateral aspect of the elbow. Recent writers seem to agree that the two most common causes for this condition, which may be either distinct or coexisting, are lateral epicondylitis and radial tunnel syndrome. Lateral epicondylitis is not limited to tennis players; 95% of the reported cases occur in non-players. The presenting symptoms are pain over the origin of the extensor carpi radialis brevis and weakness in the wrist and digital extensors. The location of maximal tenderness differentiates lateral epicondylitis from other conditions. A variety of treatments has been suggested, but the most successful is conservative treatment with rest, restriction of lifting with the palms down, anti-inflammatories and local applications of ice. Once the acute inflammatory phase has passed, a flexibility and strengthening program is recommended. Steroid injection may be utilized at this stage if the discomfort has not been reduced. In a small percentage of cases, surgery may be required.