How does TENS control pain?

How does TENS control pain?

Marc Darrow (Physical Medicine and Rehabilitation, Joint Rehabilitation Sports Medical Center, Inc. ) gives expert video advice on: When is spinal cord stimulation used?; How does TENS control pain? and more...

If I'm having neck pain use the TENS unit by placing a couple of electrodes on muscles in my neck. I can turn the dial up; increase the electricity. I'll feel tingling but I won't feel pain.