--but it is true that many people with small-fiber syndromes whose primary symptom is pain do show some autonomic disruption from time to time; often it's subclinical and fairly subtle, and shows in irregularities of blood pressure or sweat response. Of course, people whose neuropathy results from diabetes/impaired glucose tolerance are well known to expreience autonomic disruption.

See:

http://neuromuscular.wustl.edu/nothe....htm#autonomic

http://neuromuscular.wustl.edu/senso...tml#idiopathic

http://neuromuscular.wustl.edu/auton...andysautonomia