What are the most common causes of shoulder pain?

The most common causes of shoulder pain include:

•    bursitis
•    rotator cuff tendon injury and tendinitis
•    arthritis, including osteoarthritis, rheumatoid arthritis and polymyalgia rheumatica
•    adhesive capsulitis (frozen shoulder)
•    labral tear (cartilage injury)
Sometimes, problems outside the shoulder cause pain in the shoulder, a phenomenon called referred pain. Examples include neck arthritis, liver or lung diseases, and even heart attack.