Hi Dee and welcome! I don't have a really good answer for you. It seems to me that RSD is a diagnosis of last result made when the pain is way out of proportion to the injury site. I had 8 surgeries and multiple PT before I got the diagnosis. My cousin has fibro and I know that she struggles with all over pain and fatigue vs. RSD pain beginning in a specific area and then growing into other areas. Both affect the auto immune system and I have often wondered about the relationship between the two. I am sure that many more knowlegable people will be responding to this very interesting post. Lisa