Reflex sympathetic dystrophy (RSD), or complex regional pain syndrome (CRPS), is a nerve disorder that affects pain regulation.

That disease is RSD/CRPS (Reflex Sympathetic Dystrophy, also known as Complex Regional Pain Syndrome), a disproportionately severe chronic pain that develops after an injury or surgery.

Complex regional pain syndromes (CRPS) (formerly reflex sympathetic dystrophy and causalgia) are neuropathic pain conditions that are initiated by an extremity trauma or peripheral nerve lesion.

RSD or Reflex Sympathetic Dystrophy syndrome, is a nervous system disorder usually brought on by injury, Loder said. "But it could be from someone just stepping on your foot," she said.

This meeting is for you. By Veronica Chufo UPDATED: July 30, 2019 at 9:40 PM EDT Erin Dasher, 26, has been diagnosed with Reflex Sympathetic Dystrophy or Chronic/Complex Regional Pain Syndrome.

Respondents to a CRPS survey said the mean duration of the disease was between 40 and 58 months. Source: Reflex Sympathetic Dystrophy Syndrome Association ...

Katinka van der Merwe helps readers understand the symptoms associated with RSD/CRPS and explains how the syndrome stems from a malfunction in the central nervous system.