Transcutaneous electrical nerve stimulation (TENS) therapy delivers an electrical current to a painful area, stimulating sensory nerves and creating a tingly feeling that lessens the intensity of pain. The current is delivered through electrodes on small, sticky pads placed on the skin over the area in pain. TENS therapy is self-controlled through a hand-held device that can adjust the level of current.

Recently, many TENS products have been marketed as wearable, meaning they are battery operated, easily portable, and can be worn under clothing.