RSD is short for Reflex Sympathetic Dystrophy. It is also known as CRPS or Complex Regional Pain Syndrome. RSD or CRPS is a chronic pain condition that some feel is the result of the nervous system malfunctioning while others feel it is the result of the triggering of an immune system response. Which part of the nervous system malfunctions is not for sure, but most feel the peripheral nervous system is involved. I have had