When small fibers of the peripheral nervous system are damaged, this situation is known as small fiber neuropathy. Small fibers in the skin are supposed to relay sensory information about temperature and pain. Small fibers, in organs, regulate automatic functions like breathing & heart rate. An underlying health condition can be pointed by the diagnosis of small fiber neuropathy such as diabetes.
In small fiber neuropathy, symptoms such as burning, tingling & pain are observed starting in the feet and progressing up the rest of the body. Symptoms may become severe over time.
SFN is a type of peripheral neuropathy. Peripheral nervous system is affected by a peripheral neuropathy such as small fiber neuropathy. Nerves outside spinal cord & brain are included in it.