There are many types of Injuries related to shoulder pain:

Rotator Cuff: Injury to your rotator cuff is the most common—in a recent study, two-thirds of people with shoulder pain had a rotator cuff problem. A group of muscles and tendons that attach to the bones of the shoulder joint, the rotator cuff keeps the ball of your upper arm bone centered in your shoulder socket and also helps you raise and rotate your arm.

Tendonitis: Doing the same motion over and over again can lead to inflammation of the rotator cuff tendons, also called tendonitis, which can cause shoulder pain. 

Frozen Shoulder: Medically known as adhesive capsulitis, frozen shoulder results when the connective tissue that lines your shoulder joint becomes thickened and inflamed.

 Labral Tears: The labrum is a piece of cartilage attached to the rim of the shoulder socket that helps keep the ball of the joint in place. Labral tears may result from injury, or sometimes as part of the aging process. Symptoms and treatment vary depending on the type and severity of the tear.