Curious strange twinge at the back of left shoulder

Hi all,

For over a year now, I've been getting a strange twinge on my upper back to left shoulder area. The first time I felt it, I thought sometihing dropped on me like a drop of water or something. It's like a tiny electric shock and it shows up often when I exercise but also when I'm lifting my arm occasionally.

I'm just curious what that could be and whether I should be concerned.

Thanks

Clinton
 
...Still curious. Had anybody had something similar, investigated and found out? Would it be a crushed nerve or something?
 
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