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The “TENS” or the transcutaneous electrical nerve stimulation is one of the current electric devices that can stimulate nerves. It is used for therapeutic purposes. TENS refers to the nerve stimulation therapy that uses low voltage of electric current for pain relief.

Forming the basis of 'transcutaneous electrical nerve stimulation' (TENS), electrodes are wonderful little things. While they may sound complicated, how electrodes work is actually quite simple.

Basically, Electrotherapy is the use of electrical energy as a medical treatment more elaborately; it is the use of electric currents passed through the body to stimulate nerves and muscles, chiefly in the treatment of various forms of paralysis, it uses small electrical impulses to repair tissue, stimulate muscles and increase sensations and muscle strength.

Electrical stimulation for pain control was used in ancient Rome, 63 A.D. It was reported by Scribonius Largus that pain was relieved by standing on an electrical fish at the seashore.

Transcutaneous Electrical Nerve Stimulation (TENS) is the use of electric current produced by a device to stimulate the nerves for therapeutic purposes. TENS, by definition, covers the complete range of transcutaneously applied currents used for nerve excitation although the term is often used with a more restrictive intent, namely to describe the kind of pulses produced by portable stimulators.