A TENS unit (transcutaneous electrical nerve stimulator) is a small device the size of a deck of cards that can be used to control acute or chronic pain. It works by "interfering" with pain signals in the brain, flooding pain-generating tissues with small electrical currents that are believed to "compete" with the pain signals that travel to the brain, reducing the perception of pain. It does nothing to heal the inured site.
TENS units can be useful in excluding the need for medications that could be harmful to the user. It is also faster acting than ice and topical pain products.
In this video, I demonstrate how to operate a typical TENS unit and strategies to place the electrodes to achieve maximum benefit.
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Video credits to Pain & Injury Doctor YouTube channel