Hello from JA
I am Dr. Thomas, MD, board certified in internal medicine and integrative medicine, so I cover a lot of ground and can help you with your question.
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It is possible that it is related to the shoulder but actually pain that behaves like this in this distribution is more often related to the bottom of the cervical spine.
About C7 and a little further is the ulnar nerve distribution which affects the pinky, so when there is pain extending down to the pinky exclusively it is often the ulnar nerve.
IT could be pinched at the elbow but the elbow and shoulder would be comparatively rare.
What I suggest at this point is that you see a physical medicine and rehabilitation MD.
This is a doctor of PM&R and they are an expert in structure, and can; tell from exam where the pinch is likely to be, and if needed get a cervical upper thoracic MRI to look at the spine.
Better yet they can give you the correct manual therapies to fix this. Thus avoiding the possibility of future surgery.
This might involve
home exercisesphysical therapy
specialized traction therapy
Injections or electronic pain therapies if needed.
So I would do this sooner rather than later although it does not sound like an emergency at this point.
Let me know if you have further questions. Just use reply if you are not done.
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