We always recommend you consult with a licensed physician when endeavoring to find the cause of your tennis elbow. We have seen a wide range of reasons why people have experienced tennis elbow. It could be caused by improper form, too large of a grip, too small of a grip, too light of a paddle, too heavy of a paddle, or too much vibration in his or her paddle. Due to the diverse array of tennis elbow sources, you may want to try changing things up to see if it helps (e.g. get a heavier or lighter paddle, smaller grip or larger grip).