TENS stands for Transcutaneous Electrical Nerve Stimulation. It is a method of pain relief.
In TENS therapy, electrodes are placed on the skin, either directly over the painful area or more commonly, at key points along the nerve pathway. A small, battery-powered generator emits a milli-amp (one thousandth of an ampere) of electricity through lead wires to the electrodes.
How TENS relieves pain is debated. The sensation produced by the electrical stimulation appears to "override" the pain...
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Source: ADAM Encyclopedia
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