Rotator Cuff Tendonitis is caused by irritation and inflammation of the tendons of the rotator cuff muscles. This may be due to an injury or to overuse of the shoulder. It can occur in athletes who participate in throwing sports or in non-athletes with a history of recent heavy lifting or activities involving repetitive movements of the shoulder.
In Rotator Cuff Impingement Syndrome, the Rotator Cuff Tendon becomes trapped and the tendon is repeatedly scraped against the shoulder blade, leading to fraying of the tendon and possible tear.
Rotator Cuff Tears are tears in the Rotator Cuff Tendon rather than in the muscles. Rotator Cuff Tear normally happens as a result of a fall or accident in younger people. In older people, they are usually caused by Rotator Cuff Impingement Syndrome.