CRPS, RSD and Fibromyalgia all share somethings in common: weather sensitive pain, sympathetic dysfunction, and elements of Dysautonomia. Dysautonomia suggests more extensive, or global abnormality of the autonomic nervous system (ANS). The ANS is responsible for things like making our heart beat, pupils constrict and dilate, or keeping our blood pressure regular when we go from sit to stand. If just the heart rate and blood pressure are not regulated we call it Postural Orthostatic Tachycardia Syndrome (POTS). If just skin temperature and associated pain are involved we call it CRPS/RSD in more severe cases and Fibromyalgia in less extensive cases. Others just have weather sensitive pain. Learn more about these syndromes at piedmontpmr.com.