RSD is a different beast for each of us even though we all suffer pain. spread differs btwn people as well , some don't have spread, others such as myself it spreads but i don't know if it is at a rate faster than others. what i do know is what i read here and on other sites. most people whom have spinal damage are susceptible to rapid spread. what that means i don't know. I'm still experiencing spread . it strted in right toe then ankle leg groin, surgical scars , left leg, my left arm and forehead sand suspect in back and right hand. i know others where spread happened faster an others slower. its all very personal how it acts. sorry this wasn't a black and white answer. good luck