--since it involves only the smaller, unmyelinated fibers that subsume the sensations of pain, temperature, and many autonomic functions, typically don't present with motor symptoms, and reflexes are typically normal.

The sensory and autonomic symptoms may be quite diverse--dysethetic pain, numbness, odd sensations ("paratheses") with no obvious source, problems with blood pressure or digestive tract.

Take a look at:

http://www.thecni.org/reviews/13-2-p07-treihaft.htm

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