Burning like pain behind left shoulder while lifting dumbbells with right arm.?

The title explains it. It's always in the same spot, only with my right arm. It's not a lot of weight. Its a somewhat burning, sharp pain that may continue for a few seconds after about 5-7 lifts. Not sure what to do.
Answer:
Could also have something to do with the nerves. Also, if you are just starting out with doing this exercise it could be that your muscles aren't used to this yet.I would recommend talking to your dr about this to have them evaluate the situation further.

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could be muscle strain?

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Sounds like you may have a pinched nerve, I have that same pain you are describing. The doctor told me that it is a pinched nerve. good luck.

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