This transcutenaeous electrical nerve stimulation has been found to produce relief for a variety of diverse pains:

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Counterirritation is a technique that involves applying a mild irritant to the skin in order to relieve pain in another part of the body. This is thought to work by stimulating the release of endorphins, which are natural painkillers. Transcutaneous electrical nerve stimulation (TENS) is a type of counterirritation that uses electrical pulses to stimulate the nerves in the skin. This can help to relieve pain by blocking pain signals from reaching the brain.

This Transcutenaeous Electrical Nerve Stimulation Has Been Found to Produce