Sharp shoulder pain occurs with movements such as reaching overhead or into the back seat of the car.
Muscle imbalance around the shoulder alters normal movement and causes pinching or rubbing of tendons attached at the front of the shoulder. If not treated, it can gradually progress to a rotator cuff tear, which is much more difficult to treat and may require surgery.
Physical Therapy treatment involves strengthening the muscles that hold the shoulder joint in the right place while stretching/releasing tight muscles that are pulling the shoulder in the wrong direction. Stiffness in the neck or upper back may also contribute to this problem, and good therapy will always evaluate these areas as well.