I have had TENS (trascutaneous electrical nerve stimulator) treatments for back spasms in the past. Recently, my wife developed heel pain, presumptively diagnosed as plantar fascitis. I have been trying to deal with pain at the base of my thumb dignosed at arthritis (it sure doesn't feel like the arthritis I have in any other joint; this pain can shoot!) Anyway, we found that a TENS unit can be purchased on Amazon really cheap; and it works. By works, I mean that the electrodes produce the same feeling of current running across the area at issue as I had experienced at the therpapist. The thumb, after three days of twice a day stimulation, feels better. I understand that his may be placebo or coincidental. My wife has had a similar experience with the heel although she played competitive tennis yesterday and flared it up a bit. The primary use I see for this TENS device is for the next time I have a subscapular muscle spasm–I get those once in awhile. Has anyone else had experience with these units and an opinion on their use? To me, it's analogous to the old fashioned remedy of soaking anything that aches in epsom salts.