Greg Spooner May 4, 2023 Injuries & Conditions How To Treat Chronic Regional Pain Syndrome? Greg Spooner May 4, 2023 Injuries & Conditions Chronic Regional Pain Syndrome (CRPS), also known as Reflex Sympathetic Dystrophy (RSD), is a chronic pain condition that usually affects an arm, leg, hand or foot, after an injury or trauma. Here is what to do about it.