The shoulder is a ball and socket joint with a large range of movement. Such a mobile joint tends to be more
Strains from overexertion
Tendonitis from overuse
Shoulder joint instability
Collar or upper arm bone fractures
Frozen shoulder
impingement syndrome
Causes of Shoulder Pain
Diagnostic Tests
narrowing of the spinal canal, fractures and instability of the spinal column.

MRI: Magnetic resonance imaging is a noninvasive procedure that can reveal the detail of neural (nerve-related) elements.

Myelography/CT scanning: Sometimes used as an alternative to MRI

Electrodiagnostic studies: Electromyography (EMG) and nerve conduction velocity (NCV) are sometimes used to diagnosis
neck                                                        and shoulder pain, arm pain, numbness and tingling.
Bodin & Associates