Tennis Elbow

Repetitive stress causes the tennis elbow, also known as lateral epicondylitis, a painful inflammation of the elbow joint. The discomfort is on the outside (lateral) of the elbow, but it might go down the back of your forearm. When you straighten or fully extend your arm, you'll most likely experience pain.

The portion of a muscle that joins to the bone is called a tendon. The tendons that connect the forearm muscles to the outer bone of the elbow are known as forearm tendons. Tennis elbow is a condition that occurs when the extensor carpi radialis brevis (ECRB) muscle in the forearm is injured.