Each neuropathic event is different, and while there are some patterns, a lot depends on the cause if one can be found.

In small fiber neuropathies, there is often, but not always, some autonomic involvement, though this often 'subclinical' and not hard to manage. What seems to be involved is which exact types of small fibers are being damaged--some conditions are more 'pan-global', some not.

See:

http://neuromuscular.wustl.edu/sensory-small.html

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