Bursitis or Tendinitis
This is a common condition that comes from overuse and repeated movements. Repeated shoulder movements can rub or squeeze the rotator cuff.
Rotator Cuff Tears
The rotator cuff can partially tear, or there can be a tear of the full thickness of the rotator cuff. The latter may require surgery to repair the tear.
Osteoarthritis and Rheumatoid Arthritis
Arthritis can destroy the shoulder joint and surrounding tissue. this degeneration can lead to the tearing of the rotator cuff as well.