TENS is a form of electrotherapy which use a of a convenient device that applies an electrical current through the skin to stimulate sensory nerves and trigger the release of endorphins, hormones with a pain relieving property that provide a natural and effective relief of chronic pain.

The main advantage of TENS is that it makes use of natural pain relieving mechanisms, and hence has minimal side effects. Drug therapies effectively introduce foreign chemicals to achieve the same end, but in doing so alter your metabolism and bodily function, hence causing more potential side effects. The main use in physiotherapy for TENS is as a means of relieving chronic pain relief without the risk of drug interactions and/or side effects.