I have read and have been told that in small fiber sensory neuropathy autonomic symptoms typically begin to appear when the primary symptoms of the neuropathy, e.g. numbness, tingling, etc reach upper to mid calf. These include, but are not limited to bladder disturbances, gastrointestinal problems, erectile dysfunction and sweating or flush sensations in the neck and head area. This is also the time when the finger tips begin to show the first signs of sensory neuropathy.