{Reference Type}: Consensus Development Conference {Title}: Definition and diagnosis of small fiber neuropathy: consensus from the Peripheral Neuropathy Scientific Department of the Brazilian Academy of Neurology. {Author}: Gondim FAA;Barreira AA;Claudino R;Cruz MW;Cunha FMBD;Freitas MRG;França MC;Gonçalves MVM;Marques W;Nascimento OJM;Oliveira ASB;Pereira RC;Pupe C;Rotta FT;Schestatsky P; {Journal}: Arq Neuropsiquiatr {Volume}: 76 {Issue}: 3 {Year}: Mar 2018 {Factor}: 2.035 {DOI}: 10.1590/0004-282x20180015 {Abstract}: The aim of this study was to describe the results of a Brazilian Consensus on Small Fiber Neuropathy (SFN). Fifteen neurologists (members of the Brazilian Academy of Neurology) reviewed a preliminary draft. Eleven panelists got together in the city of Fortaleza to discuss and finish the text for the manuscript submission. Small fiber neuropathy can be defined as a subtype of neuropathy characterized by selective involvement of unmyelinated or thinly myelinated sensory fibers. Its clinical picture includes both negative and positive manifestations: sensory (pain/dysesthesias/pruritus) or combined sensory and autonomic complaints, associated with an almost entirely normal neurological examination. Standard electromyography is normal. A growing list of medical conditions is associated with SFN. The classification of SFN may also serve as a useful terminology to uncover minor discrepancies in the normal values from different neurophysiology laboratories. Several techniques may disclose sensory and/or autonomic impairment. Further studies are necessary to refine these techniques and develop specific therapies.