What is CRPS?  Complex Regional Pain Syndrome (CRPS) which currently replaces the term Reflex Sypathetic Dystrophy RSD is a chronic erve disorder that occurs most often in the arms or legs after a minor or major injury. 

CRPS 1 is associated with severe pain; changes in the nails, bone and skin; and an increased sensitivity to touch in the affected limb.  CRPS2 replaces the term causalgia, and results from an identified injury to the nerve. 

The cause of CRPS is not completely understood. It is thought to result from damage to the nervous system, including the nerves that control the blood vessels and sweat glands.

The damaged nerves are no longer able to properly control blood flow, sensation, and temperature to the affected area. This leads to medical problems in the nerves, blood vessels, skin, bones, and muscles.

This condition is more common in people between the ages of 40-60, but has been seen in younger people too.