A Tens Unit, or transcutaneous electrical nerve stimulation machine, can help back and neck pain that may be caused by trauma or continual strain. The body responds to such pain or injury with muscle guarding, an attempt to immobilize the painful area by tightening the muscles surrounding the injury. Muscle guarding impairs circulation in the affected area.
The decrease in blood supply leads to a decrease in metabolism with an accumulation of waste products. TENS therapy (transcutaneous electric nerve stimulator) can help break this pain cycle and aid in the normal healing process. We do recommend you read over How a Tens Units Works. to fully understand electrotherapy.