Most common causes of Shoulder Pain

Fracture
Contusion
Acromial-clavicular joint separation or injuries
Rotator cuff tendonitis, rupture or impingement syndrome
Bursitis
Bicipital tendonitis (long head)
Referred pain
· Diaphragmatic irritation
o Biliary disease
o Myocardial infarction, angina, pericarditis
o Blood or gas in peritoneal or pleural cavity
o Subphrenic abscess
o Splenic rupture
o Neoplasm
o Lower lobe pleuropulmonary inflammatory disease
· Apical lung cancer (Pancoast syndrome)
· Cervical radiculopathy and brachial neuritis
Osteoarthritis
Infectious, rheumatoid, or crystalline arthritis
Arthritis associated with collagen vascular disease
Anterior or posterior shoulder instability
Shoulder-hand syndrome
Neoplasm, primary or metastatic

Local arterial, venous, or lymphatic occlusion
Adhesive capsulitis
Carpal tunnel syndrome
Thoracic outlet syndromes
· Cervical and first rib syndromes, scalenus anterior syndrome
· Hyperabduction syndrome
· Costoclavicular syndrome
Psychogenic pain
Sleep dysesthesias
Postural
Congenital or developmental abnormalities

References
1. Harris R. See Bibliography, 1, pp. 475-504.
2. Mercier L. See Bibliography, 2, pp. 48-74.