How long can a pinched nerve in left under arm extending down to inner elbow last?

LadyB2310

New member
I think I have a pinched nerve in my left underarm. It is hard to raise my left arm and when I do it feels like it's pulling. I can't raise my arm all the way. The pain has spread from my underarm on down to the inside of my elbow and is swollen. How long will this pain last?
 
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