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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).
1 There is decreased range of motion of the shoulder because of pain and muscle spasm. 2  Acute pain from bleeding and muscle spasm: This may resolve in a few days.  Large tears may cause the inability abduct the arm (raise it away from the side of the body) due to significant pain and loss of muscle power.