Thanks for your query.
You are most likely suffering from either, rupture of a few muscle fibers; 'pinching' of the network of nerves (located beneath the shoulder joint, near the armpit) supplying the arm; stretch of a muscle tendon; or, a mild injury
to the shoulder joint.
Complete rest to the shoulder joint and affected arm, along with a short course of anti-inflammatory pain-killers, such as, a combination of ibuprofen
+ a muscle relaxant
(such as, Chlorzoxazone
) will cure the problem.
Consult your doctor and apprise him of my opinion. I am certain that he will agree with me and prescribe the advised drugs in appropriate doses.
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Dr. Rakesh Karanwal