Formerly known by various names, including causalgia and reflex sympathetic dystrophy, complex regional pain syndrome is a condition in which there is long-lasting pain, usually in an arm or leg, but sometimes affecting other areas of the body as well.
It is most often triggered by an injury, but the pain is more severe and long-lasting than would be expected from the severity of the injury.
The skin over the painful area may be red and tender, or blue, cold, and clammy.
It may be so sensitive that even a light touch may provoke intense pain.
Complex regional pain syndrome may develop after either a minor or more serious injury, including fractures, sprains or strains, burns, or cuts. However, it is unknown why some people develop the condition after such injuries whereas others do not.
There is no cure for complex regional pain syndrome, but symptoms may be controlled with a combination of medication, psychological therapy, and physical rehabilitation

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