Answer(s):
Shoulder trauma or muscle strain.
Shoulder Trauma : Trauma to the shoulder is common. Injuries range from a separated shoulder resulting from a fall onto the shoulder to a high-speed car accident that fractures the shoulder blade (scapula) or collarbone (clavicle).
One thing is certain: everyone injures his or her shoulder at some point in life.
Muscle strain : Muscle strain or a "pulled muscle" is a partial or complete tear of a muscle. These injuries occur in muscles that cross two joints, during explosive action, such as sprinting, during times when athletes suddenly increasing their exercise regimens (such as during training camps).
