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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Left axillary nerve or brachial plexus palsy can cause such numbness and weakness.
This is also known as Klumpke palsy.
Usually takes several days to recover from.
Can be confirmed by nerve conduction test.
Physical therapy will help.
The problem occurs due to the wrong sleeping posture or pressure on the arm pit at chair arm handle.
Here is the link:
https://en.wikipedia.org/wiki/Klumpke_paralysisBest wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/