Tennis elbow, also known as lateral epicondylitis, is a painful condition that develops when the tendons in your elbow are overloaded, typically as a result of performing the same wrist and arm motions over and over again. The tendons of your forearm muscles attach to a bony bump on the outside of your elbow, and this is the location that causes the majority of the pain associated with tennis elbow. Your forearm and your wrist may also start to hurt as a result of the pain. The tendons that join the muscles of the forearm on the exterior of the elbow can become inflamed, causing a condition known as tennis elbow. The muscles and tendons in the forearm can become damaged from overuse, which is when the same motions are repeated over and over again. Because of this, you’ll feel pain and tenderness on the exterior of your elbow.