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.

These disorders include multiple system atrophy, pure autonomic failure, reflex sympathetic dystrophy, hypotension, postural orthostatic tachycardia syndrome (POTS), fainting, abnormalities of ...

(The syndrome was formerly known as reflex sympathetic dystrophy, according to the organization.) "[The] pain is excruciating, way more than you would expect," said Dr. Javier Webar ...