<unk>  is uncommon, and its cause is not clearly understood.<unk>  typically develops after an injury, surgery, heart attack, or stroke. Investigators estimate that 2–5% of those with peripheral nerve injury, and 13-70% of those with hemiplegia (paralysis of one side of the body) will develop<unk> . In addition, some studies have indicated that cigarette smoking was strikingly present in patients and is statistically linked to RSD. This may be involved in its pathology by enhancing sympathetic activity, vasoconstriction, or by some other unknown neurotransmitter-related mechanism. This hypothesis was based on a retrospective analysis of 53 patients with RSD, which showed that 68% of patients and only 37% of controls were smokers. The results are preliminary and are limited by their retrospective nature. 7% of people who have<unk>  in one limb later develop it in another limb.
Complex regional pain syndrome
Thoracic outlet syndrome
Calpainopathy
Myofascial pain syndrome
Central pain syndrome
Nerve compression syndrome
Radiation-induced lumbar plexopathy
Polymyalgia rheumatica