Elbow pain refers to any type of pain or discomfort in the elbow joint of your arm. Anyone can experience elbow pain. Usually, elbow pain is caused by an injury, such as a blow to the elbow, or inflammation of the elbow joint. The most common cause of elbow pain is tennis elbow, which causes pain on the outside of the elbow. Tennis elbow is an overuse injury, which is more likely not caused by tennis but work activities or repetitive strain. Golfers elbow is similar to tennis elbow but causes pain on the inside of the elbow.