@burrningfeet in Phoenix here...My understanding is small fiber neuropathy (SFN) is a specific kind of peripheral neuropathy and it too has specific kinds of forms but generally affects the small nerve fibers in the body. Peripheral neuropathy is a more general form of neuropathy affecting the nervous system of the body and and can include large and small nerve fibers Most cases begin in the feet and progress upwards but not always. Sometimes these nerve fibers are not even lost but can be damaged or injured say due to an accident or even non-functional... but there is pain but sometimes numbness or other symptoms. PN includes such things like Tarsal Tunnel Syndrome or nerve entrapment, nerve injury etc. Can include almost anything except nerves affecting the spine and brain. The scientific literature is not always clear on this as I have seen SFPN used as an acronym for Small Fiber Peripheral Neuropathy and Small Fiber Polyneuropathy...not to be confused with SFMN which affects one particular peripheral area of the body...There is an article Todd Levine that breaks SFN down into very specific types. I'll look through my files and see if I can find it. I welcome any other clarification as I am new to this...Pam