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PubMed This is a summary of 71 peer-reviewed journal articles Updated
Neurology · Small Fiber Neuropathy

Small Fiber Neuropathy: A Comprehensive Patient Guide

At a Glance

Small fiber neuropathy (SFN) is a nerve disorder that causes burning pain, tingling, and autonomic issues due to damage to microscopic nerve endings. Because standard tests like EMGs only check large nerves, SFN is typically diagnosed using specialized skin biopsies.

Welcome to the comprehensive resource guide for Small Fiber Neuropathy (SFN). If you have been struggling with burning pain, tingling, or unexplained autonomic symptoms—often while being told your tests are “normal”—this guide is designed to help you understand your condition and advocate for your care [1][2].

Small Fiber Neuropathy is a peripheral nervous system disorder characterized by the loss or dysfunction of the smallest nerve endings in your skin and organs [3]. Because these fibers are too small to be seen on standard neurological tests, patients often face a long and frustrating journey to get an accurate diagnosis [4].

This guide translates the medical research into actionable information to help you partner with your doctors. Explore the sections below to learn more about navigating your diagnosis and daily life:

01

Validation & Orientation: Understanding Small Fiber Neuropathy

Learn why your standard nerve tests are normal with small fiber neuropathy (SFN). Understand your burning pain, skin punch biopsies, and autonomic symptoms.

02

Symptoms and Differential Diagnosis: Recognizing SFN vs. Fibromyalgia

Learn the key differences between small fiber neuropathy (SFN) and fibromyalgia. Understand symptoms, central vs peripheral pain, and why misdiagnosis happens.

03

Diagnostic Testing: Making Sense of Skin Biopsies, QSART, and Normal EMGs

Learn how small fiber neuropathy (SFN) is diagnosed when EMGs are normal. Understand skin punch biopsies, IENFD scores, QSART sweat tests, and your results.

04

Exploring Underlying Causes: Diabetes, Autoimmune, and Genetic Links

Learn about the underlying causes of Small Fiber Neuropathy (SFN). Explore how prediabetes, autoimmune diseases like Sjögren's, and genetics trigger nerve damage.

05

Standard of Care Treatment: Managing Pain and Root Causes

Learn the standard of care for Small Fiber Neuropathy (SFN) treatment. Discover how to manage nerve pain, address root causes, and explore advanced options.

06

Living with SFN: Care Team, Autonomic Symptoms, and Daily Life

Learn how to manage daily life with Small Fiber Neuropathy (SFN). Discover strategies for building a care team and handling autonomic symptoms like POTS.

Common questions in this guide

What is small fiber neuropathy?
Small fiber neuropathy is a peripheral nervous system disorder where the microscopic nerve endings in your skin and organs become damaged or dysfunctional. This typically results in burning pain, numbness, tingling, and sometimes autonomic issues like dizziness.
Why is my EMG normal if I have severe nerve pain?
Standard electromyography (EMG) and nerve conduction studies only measure large nerve fibers. Because SFN affects the smallest nerve endings, standard EMGs cannot detect the damage and often come back completely normal despite severe symptoms.
How is small fiber neuropathy diagnosed?
Neurologists typically diagnose SFN using specialized tests that look specifically at small nerves. The most common methods are a skin punch biopsy to evaluate nerve fiber density or a QSART test to measure autonomic sweat responses.
What causes small fiber neuropathy?
SFN can be triggered by various underlying conditions. The most common root causes include diabetes, autoimmune disorders, and specific genetic mutations. When doctors cannot find an underlying cause, it is referred to as idiopathic small fiber neuropathy.
How do you treat small fiber neuropathy?
Effective management involves a dual approach: treating the underlying cause (such as controlling blood sugar or managing an autoimmune condition) to prevent further damage, and using specialized nerve pain medications to improve daily quality of life.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Are you experienced in treating both the sensory and autonomic symptoms of small fiber neuropathy?
  2. 2.Given my symptoms, what specialized testing beyond a standard EMG is appropriate for me?
  3. 3.What is your approach to investigating the underlying causes of nerve damage, rather than just treating the pain?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (4)
  1. 1

    Small Fiber Polyneuropathy Is Prevalent in Patients Experiencing Complex Chronic Pelvic Pain.

    Chen A, De E, Argoff C

    Pain medicine (Malden, Mass.) 2019; (20(3)):521-527 doi:10.1093/pm/pny001.

    PMID: 29447372
  2. 2

    Small fiber neuropathy with long-term, multifocal paresthesias after a SARS-CoV-2 vaccination.

    Finsterer J, Scorza FA, Scorza CA, de Almeida AG

    Clinics (Sao Paulo, Brazil) 2023; (78()):100186 doi:10.1016/j.clinsp.2023.100186.

    PMID: 36948070
  3. 3

    Small fiber neuropathy: Getting bigger!

    Chan AC, Wilder-Smith EP

    Muscle & nerve 2016; (53(5)):671-82 doi:10.1002/mus.25082.

    PMID: 26872938
  4. 4

    Non-length-dependent small fiber neuropathy: Not a matter of stockings and gloves.

    Gemignani F, Bellanova MF, Saccani E, Pavesi G

    Muscle & nerve 2022; (65(1)):10-28 doi:10.1002/mus.27379.

    PMID: 34374103

This guide provides educational information about small fiber neuropathy and its diagnosis. It is for informational purposes only and does not replace professional medical advice from a neurologist or healthcare provider.

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