A common cause of shoulder pain in young, active individuals involved in sports is an underlying instability. Shoulder instability is an increased or abnormal sliding in the shoulder joint. Shoulder instability is a common disorder in contact athletes, swimmers and throwers.
Shoulder instability ranges from minor instability and subluxation, imperceivable to full dislocation. Full shoulder dislocation is usually caused by a traumatic injury, such as a car accident or sports-related injury.