Many people refer to any pain in the shoulder as bursitis. The term bursitis really means that part of the shoulder called the bursa is inflamed. Tendonitis is when a tendon gets inflamed. Many problems can cause inflammation of the bursa or tendons. Impingement syndrome can result in pain with overhead or across the chest type motions. It occurs when the rotator cuff tendons rub against the roof of the shoulder, the acromion.
Learn more about common conditions of the shoulder here.