A transcutaneous electrical nerve stimulation (TENS) unit is a device that sends small electrical currents to targeted body parts. These currents are used to relieve pain. Some TENS units are designed for use in a hospital or healthcare facility. Others are safe to use at home.Click to see full answer. Hereof, what does a TENS unit do for muscles?TENS is a machine that delivers a different range of pulses to muscles and tissue meant to confuse or negate pain signals. It is also designed to release endorphins. This is specifically for pain reduction. Since it does not cause a full muscle contraction, TENS can’t be used to build muscle.One may also ask, how often should you use a TENS unit? You can safely use a TENS machine as often as you like. Usually for 30-60 minutes up to 4 times daily. TENS can provide relief for up to four hours. Herein, does a TENS unit promote healing? CONCLUSION. It is suggested that TENS stimulates skin wound healing and tendon repair, as well as the viability of random skin flaps. Such effects may be due to the release of SP and CGRP, which would increase blood flow and, consequently, hasten the events of tissue repair.Are TENS units dangerous? TENS costs and safety Although there is a tiny risk of mild shock from faulty devices, consumer TENS units are just too weak to be dangerous, and the risk of too much juice in a medical setting is extremely low. 8 Overzealous self-treatment might cause some skin irritation around the electrodes.