Transcutaneous Electrical Nerve Stimulation (TENS) is the use of electric current produced by a device to stimulate the nerves for therapeutic purposes.

TENS is a non-invasive, low-risk nerve stimulation intended to reduce pain, both acute and chronic. TENS has been used as a solution for back pain for over 25 years and has been studied extensively to demonstrate its benefits. In a meta-analysis of studies examing the use of TENS therapy Johnson & Martinson* published a review of 39 randomised controlled trials. They concluded that the studies demsonstrate a "highly significant reduction in pain with the use of ENS (TENS) compared to placebo controls". In addition Fishbain et. al.* found that 376 chronic pain patients who had used TENS therapy for 6 months or more reported average satisfaction and comfort ratings of 8.19 and 8.35 out of 10 respectively.

*Johnson and Martinson, Efficacy of electrical nerve stimulation for chronic musculoskeletal pain: a meta-analysis of randomized controlled trials'' Pain 130 (2007) [157-165]

*Fishbain DA, Chabal C, Abbott A, Wippermein Hein L, Cutler R. Transcutaneous Electrical Nerve Stimulation (TENS) treatment outcome in long term users.  Clinical Journal of Pain (1996) [12: 201-14]