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Hello,Thank you for your question.I am Dr Saha, I shall try my best to help you.
There is a possibility of nerve impingement in the back.
The pain can radiate down the arm with weakness.
Other possibility for pain in left arm is related to heart.
I would suggest to take an examination by doctor.
Motrin or naproxen can be taken for pain, meanwhile.
You can need X ray/ scan, EKG for it.
I hope this information helps.If there’s anything else I can do, please let me know.If you are satisfied, please rate my answer as good or excellent.Regards.