The others give great info, but I want to add something that I have used to help my family and some friends understand the level of pain. I have shown them the McGill Pain Index, my husband said it shows the pain levels in a different way. We all know that RSD/CRPS is so misunderstood and no one can ever comprehend the level of pain we experience because they can't see it and if they can't see it, then it must not be that bad right?? It is so aggravating!! It really helped my sisters understand better when I showed it to them.