Just below your elbow, the muscles in the back of your forearm converge into the common extensor tendon.
That point, can be aggravated by sports such as tennis, but also by computer use or extended time gripping a pen.
A similar condition exists for golfers called medial epicondylitis.
Often, tennis or golf elbow goes undiagnosed or misdiagnosed as carpel tunnel syndrome until the pain is significant.
Fortunately, the quickest path to relief in most cases is a qualified massage therapist who knows how to find and treat the trigger point causing the pain.