What is complex regional pain syndrome in plain english?

This article is written  by Lorimer Moseley, an Australian Physiotherapist at the absolute forefront of the pain sciences. The article explains CRPS (Complex Regional Pain Syndrome), a challenging condition causing ongoing pai and an array of symptoms. CRPS used to be known as 'RSD - Reflex sympathetic dystrophy'. 

 Any article written by this author comes highly recommended.