TENS stands for Transcutaneous Electrical Nerve Stimulation and is a safe, noninvasive, drug-free method of pain management. TENS is predominately used for nerve related pain conditions. TENS machines work by sending stimulating pulses through electrodes across the surface of the skin and along the nerve strands. The stimulating pulses help prevent pain signals from reaching the brain. TENS can also help stimulate your body to produce higher levels of its own natural painkillers, called “Endorphins”.