Shoulder pain causes include:

1. Avascular Necrosis (Osteonecrosis) (The death of bone tissue due to limited blood flow.)
2. Brachial Plexus Injury
3. Broken Arm
4. Broken Collerbone
5. Bursitis (A condition in which small sacs that cushion the bones, tendons and muscles near joints become inflamed.)
6. Cervical radiculopathy
7. Dislocated Shoulder
8. Frozen Shoulder
9.  Heart Attack
10. Impingement
11. Muscle Strains
12. Osteoarthritis (The most common type of arthritis.)
13. Polymyalgia Rhumetica
14. Rhumetoid Arthritis
15. Rotator Cuff Injury
16. Separated shoulder
17. Septic Arthritis
18. Sprains (Stretching or tearing of a tissue band called a ligament, which connects two bones together in a joint.)
19. Tendinitis (A condition that happens when swelling called inflammation affects a tendon.)
20. Tendon rupture
21. Thorasic Outlet Syndrome
22. Torn cartilage