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How TENS machines work

Electrodes are taped on to your back and connected by wires to a small battery-powered stimulator. Holding this, you give yourself small, safe amounts of current through the electrodes. You can move around while you use TENS. 

TENS is believed to work by stimulating the body to produce more of its own natural painkillers, called endorphins. It also reduces the number of pain signals sent to the brain by the spinal cord.

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