I have had the healthy wave mat for a few weeks now. Initially, the phototherapy upset my digestive system. Don't know whether this was a detoxifying symptom or not. I have just had my thyroid blood results back and my thyroid was very much underactive, so that could be responsible too. I am so much better now pain wise and the spasms in my leg muscles have reduced significantly. I have two PEMF treatments each day. I missed them yesterday and could not sleep for ages because my legs were aching so much, just by missing a day. I am actually not sure how I could live without it now. I still have to take other things for my pain, but I have been able to reduce what I was taking, and I hope that I will continue to improve with time. If you do suffer from Hypothyroidism, do not overdo the heat or the phototherapy, and keep a regular eye on your bloods. Buy a mat, I do not think you will be disappointed!