Definition

Complex regional pain syndrome (CRPS) refers to a chronic condition affecting the nerves and blood vessels of one or more extremities. It is distinguished by extremely unpleasant burning sensations, swelling, sweating, color changes, and other distressing symptoms.

There are two types of CRPS:

• CRPS 1 (also called reflex sympathetic dystrophy or RSD)— No nerve damage exists with this type.
• CRPS 2 (also called causalgia)—This produces similar symptoms after a nerve injury has occurred.

Complex Regional Pain Syndrome

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