Severe shoulder pain in a diabetic?

Shoulder first: First consider intrinsic shoulder problems, torn muscle, arthritis of the joint, etc.Than consider refered pain neck arthritis, neuropathic refered pain, etc.Have your primary doctor refer you to a specialist if the cause is not evident.

Frozen shoulder.: It could be a frozen shoulder, although your kind of young for that. However, there is a significant increase in frozen shoulders among diabetics.

Get evaluated: Severe shoulder pain could have multiple causes including infection, nerve compression, trauma, and even a neoplasm. A physical examination and diagnostic imaging will likely be necessary.