Pain is thought to be controlled by a TENS Machine in one of two ways: ​

Sensory Level Stimulation – The Gate Control theory of pain means that the electrical input of the TENS machine interferes with the transmission of pain signals, by blocking the neural “gate” through which the pain travels.

Motor Level Stimulation – The goal of motor level stimulation is to cause the release of the body’s own pain-easing chemicals called endorphins to achieve pain relief.