Complex regional pain syndrome (CRPS) or reflex sympathetic dystrophy (RSD) is a chronic pain condition in which high levels of nerve impulses are sent to an affected site. Experts believe that CRPS occurs as a result of dysfunction in the central or peripheral nervous systems.
CRPS is most common in people aged 20-35. The syndrome also can occur in children; it affects women more often than men.
WHAT CAUSES COMPLEX REGIONAL PAIN SYNDROME?
CRPS most likely does not have a single cause; rather, it results from multiple causes that produce similar symptoms. Some theories suggest that pain receptors in the affected part of the body become responsive to catecholamines, a group of nervous system messengers. In cases of injury-related CRPS, the syndrome may be caused by triggering the sympathetic nervous system response which may lead to redness, warmth, and swelling in the affected area.