Hi Debbie, I didn't know it could be used for the pain of RSD etc. I learned something new from you. I will go on line and do some research. I sure hope if you do this, that it works for you. I am sorry you have to suffer from this kind of pain. I don't have full blown RSD, just on my foot, ankle, calf. No spreading other than that, but I am sure worried. Take care, ginnie