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Pain is unaltered by neck or arm movements. Pain is spontaneous, often with no apparent cause. Gradual decrease in pain followed by marked weakness of upper arm. Neurologic deficits indicate that more than one nerve is involved (i.e., lesion in the plexus).
Often, muscular irritation and upper back pain is due to either de-conditioning (lack of strength) or overuse injuries (such as repetitive motions). Muscle strains, sports injuries, auto accidents, or other injuries can all result in pain from muscular irritation.