Bursitis is an inflammation or irritation of the bursa, which is a small sac located between a bone and muscle, skin, or a tendon. The bursa allows smooth gliding between these structures. The subacromial bursa helps the motion of the rotator cuff in activities such as overhead work. Bursitis often develops secondary to injury, impingement, overuse of the muscle, or calcium deposits. Common symptoms of sub-acromial bursitis include: pain, loss of active movement, local tenderness and burning pain.​