TENS therapy, or Transcutaneous Electrical Nerve Stimulation therapy, is a non-invasive and low-risk device that uses electric currents to stimulate nerves to relieve pain conditions. Electrodes placed on the skin near the affected area send impulses of varying frequency and intensity to treat either short term or chronic pain. It is a great pain management alternative for those who are wary of drugs or other possibly addictive painkilling methods.