Our expert says:
A Transcutaneous Electrical Nerve Stimulator, more commonly referred to as a TENS unit, is an electronic device that produces electrical signals used to stimulate nerves through unbroken skin.
TOS causes pressure on the nerves of your arms. Read more about TOS at http://www.mayoclinic.com/print/thoracic-outlet-syndrome/DS00800/DSECTION=all&METHOD=print
Have you tried physiotherapy?
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