We’ve been using the Flash to help skin problems and joint pain with success. A friend of mine tried the Flash on my sore thumb joint and the pain was greatly reduced. I am not sure how long the treatment lasted but it worked so well we ordered one. We now have a Flash of our own and are using it on my hand and on my wife’s skin. I will try to report on our results. The Flash was not advertised for sore joints but it greatly reduced my pain so we tried it ourselves with our new Flash and it really helps.