@chandyjohn1 -- Excerpt from the link below: "Peripheral nerves contain both large fibers covered with a kind of insulation and very thin, small, uninsulated fibers. The large fibers, for example, carry messages from the brain telling muscles to move. Small fibers transmit sensory information about dangerous stimuli, whether external (pain, burning heat, freezing cold) or internal, and control autonomic (involuntary) functions such as heart rate and blood pressure."

Harvard Medical -- New thinking on peripheral neuropathy (Sept 2019)
-- https://www.health.harvard.edu/diseases-and-conditions/new-thinking-on-peripheral-neuropathy

I see in a previous post you mentioned having diabetic neuropathy. Have you seen the following discussion on Connect?

> Groups > Neuropathy > Diabetic Neuropathy progressing?
-- https://connect.mayoclinic.org/discussion/diabetic-neuropathy-progressing/