TENS stands for transcutaneous electrical nerve stimulation—TENS units and machines 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 pain relief devices can help break this cycle and aid in the normal healing process. We do recommend you read over How a TENS Unit Works to fully understand electrotherapy. Our digital TENS units use the latest technological advances to deliver personalized therapy for muscle aches