Tendinitis means inflammation of a tendon, in which micro cracks and areas of necrosis. The shoulder tendinitis can affect especially the long head of the brachial biceps and muscles called the rotator cuff: supraspinatus, infraspinatus, teres minor and subscapularis. The main causes of this injury include age, repetitive in certain work activities or throwing sports movement, and poor blood supply to the tendons of the supraspinatus and infraspinatus muscles, a fact that favors degenerative processes. Symptoms of shoulder tendinitis are inflammatory pain, the pressure on the tendon, pain in performing active movements of the shoulder and pain upon stretching the muscle tendon. The appropriate treatment for shoulder tendonitis is physiotherapy.