The shoulder is a very complex joint affected by many muscles. It is therefore prone to a variety of injuries. Some of the injuries, such as a frozen shoulder where the joint capsule is jammed, may be chronic and take a long time to repair while others will be more straightforward and easier to resolve. The therapist will try to identify the injured muscle and will treat it by a combination of massage and stretching. Shoulder injuries will usually require several sessions with the therapist to achieve full recovery.
Since shoulders are vulnerable areas, it is essential for athletes to work at preventing shoulder injuries in the first place. The sports massage therapist should be able to recommend appropriate stretches. Correct technique in the specific sport can also be important and should be considered when you have a shoulder injury (e.g. poor technique in kayaking often leads to dislocated shoulders).