They are mainly used to reduce pain resulting from various disease entities. This applies to both acute and chronic pain conditions. TENS currents reduce recovery time after injury, surgery or immobilization.
The method is based on stimulation, by low-frequency current, of sensory nerve endings, which causes inhibition of conduction of pain stimuli. The currents, by stimulating the secretion of naturally occurring pain substances in the body – so-called endogenous opioids – trigger an analgesic response.