Complex Regional Pain Syndrome (CRPS) [formerly called Reflex Sympathetic Dystrophy or RSD] is a poorly understood chronic pain disorder presenting with an array of challenging symptoms. Characterized by prolonged/excessive pain with changes in skin temperature and color and/or swelling, CRPS does not respond positively to traditional treatment approaches. This image is an example of severe CRPS of the hand resulting in extreme stiffness.
Be aware, however, that the diagnosis of CRPS may be used incorrectly to describe a heightened sympathetic nervous response to trauma. Such a heightened sympathetic response does respond logically to gentle customary treatment approaches.
The National Institute of Neurological Disorders and Stroke provides more in-depth information about CRPS.
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