“Golfer's elbow (medial epicondylitis) causes pain and inflammation in the tendons that connect the forearm to the elbow. The pain centers on the bony bump on the inside of your elbow and may radiate into the forearm.” “Despite the name, this condition doesn't just affect golfers. Any repetitive hand, wrist, or forearm motions can lead to a golfer's elbow. Risky sports include tennis, bowling, and baseball -- in fact, it's sometimes called pitcher's elbow. People may also get it from using tools like screwdrivers and hammers, raking, or painting.”

REF; http://www.webmd.com/fitness-exercise/golfers-elbow-basics

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