Shoulder pain without injury: the key components

What are the most common causes of shoulder pain which have not resulted from injury? 

There are several ways that shoulder pain can occur; it is not always due to injury. The following are common causes of shoulder pain not resulting from injury:

• Acromioclavicular Joint Arthritis.
• Long head of Biceps Pathology.
• Calcific Tendonitis.
• Frozen Shoulder.
• Shoulder Arthritis.
• Shoulder Instability.
• SLAP Tear due to degenerative disease.
• Subacromial Impingement/Bursitis.
• Sternoclavicular Joint Pain.
• Rotator Cuff Tear due to degenerative disease.
• Shoulder infection.
• Shoulder tumour.
• Pain referred from neck or other sources.