Tennis elbow is a painful condition that occurs when tendons in your elbow are overworked, usually by repetitive motions of the wrist and arm. Despite its name, most cases of tennis elbow occur in people who don't play tennis. People whose jobs feature the types of motions that can lead to tennis elbow include plumbers, painters, carpenters and butchers. The pain of tennis elbow occurs primarily where the tendons of your forearm muscles attach to a bony bump on the outside of your elbow. Pain can also spread into your forearm and wrist.