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Small fiber neuropathy means damage to tiny nerve fibers. These fibers help with pain, heat, cold, and touch. Some also help control sweating, heart rate, blood pressure, and gut movement.
When small fibers get hurt, people often feel burning, tingling, stabbing pain, or numbness. Symptoms often start in the feet. Symptoms may move up the legs over time. Some people also feel dizziness when standing, fast heart rate, dry eyes, dry mouth, or gut trouble.
Small fibers act like wiring for two big jobs:
First job: feeling. Small fibers send signals for pain and temperature.
Second job: body control. Some small fibers help run automatic tasks, like sweating and blood flow.
Large nerve tests often miss small fiber damage. Nerve conduction studies focus on large fibers. Small fiber neuropathy often shows normal results on those tests. This gap frustrates many people.
Doctors see many causes. A few causes show up often.
Sometimes no clear cause shows up, even after solid testing. Doctors still treat symptoms and keep looking for drivers.
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Skin biopsy
Skin biopsy measures nerve fibers in the outer skin layer. Labs often report intraepidermal nerve fiber density. Low density supports small fiber neuropathy. Many experts view skin biopsy as a key objective test.
Corneal confocal microscopy
This test uses a special eye scan to look at tiny nerve fibers in the cornea. Research supports use as a fast, noninvasive way to measure small fiber loss and regrowth. Some clinics use this test as an add-on, or when skin biopsy access stays limited.
Autonomic testing
When dizziness, sweating changes, or heart rate swings show up, autonomic testing may help. Some clinics use QSART, tilt testing, and other tools. These tests support the full picture.
Lab work to find drivers
A solid lab plan often checks glucose control, thyroid markers, B12 and related markers, autoimmune markers, inflammation markers, and more. The best panel depends on symptoms and history.
A decade ago, many people with burning feet heard, “tests look normal.” Skin biopsy and corneal nerve imaging helped change that. More doctors now recognize small fiber neuropathy and confirm the diagnosis with objective measures.
The goal stays simple. Confirm nerve injury. Then find the driver. Then build a plan.
Researchers describe a target called the innate repair receptor. The goal involves calming injury signals and supporting repair after damage.
If you want a deeper look at ARA-290 and how clinicians use the research, read our ARA-290 guide.
Some clinical studies in sarcoidosis-related small fiber neuropathy reported symptom improvement and changes in small fiber measures, including corneal nerve measures.
Research still evolves. ARA-290 does not replace a full workup. A full plan still starts with diagnosis, driver search, and basics like glucose control, sleep, movement, and nutrition.
Step 1: Confirm the diagnosis
A clear diagnosis prevents wasted time. Skin biopsy and corneal nerve imaging often help.
Step 2: Find the driver
Blood sugar issues, autoimmune disease, toxins, and nutrition problems often sit at the center.
Step 3: Protect nerves
Stable blood sugar, steady sleep, and less alcohol help nerve health.
Step 4: Treat pain and function
Doctors use multiple options. Some options target nerve pain signals. Others target sleep and stress. A plan should match symptoms and risk factors.
Step 5: Consider advanced options when the foundation stays solid
Some people ask about peptides such as ARA-290. In our clinic, a physician reviews symptoms, meds, history, and labs first. A physician discusses peptides after the review. A physician prescribes peptides only after a medical consult.
Seek urgent care for sudden weakness, sudden numbness on one side, new bowel or bladder loss, severe new back pain with leg weakness, or fast symptom spread. These signs need rapid evaluation.
This article aims to teach, not replace medical care. If burning, tingling, numbness, or dizziness keeps showing up, a focused plan helps. You can schedule a paid consultation through our website. We will review your story, prior tests, and next best steps.
What is small fiber neuropathy?
Small fiber neuropathy is damage to tiny nerve fibers. These fibers help you feel pain and temperature. Some also help control sweating, heart rate, and gut movement.
Why do my nerve tests look normal?
Many nerve tests focus on big nerve fibers. Small fibers often slip past those tests. A normal EMG does not rule out small fiber neuropathy.
What tests help confirm small fiber neuropathy?
Skin biopsy measures nerve fibers in the skin and gives an IENFD result. Corneal confocal microscopy measures small fibers in the cornea. Autonomic tests help when dizziness, fast heart rate spells, or sweat changes show up.
Does ARA-290 treat small fiber neuropathy?
Research in sarcoidosis-associated small fiber neuropathy links ARA-290 with symptom improvement and improved small fiber measures in some studies. A clinician still needs to confirm diagnosis, look for drivers, and build a full plan before discussing any advanced therapy.
About The Author
Alexander Y. Zubkov, MD, PhD, is a board-certified neurologist who blends traditional neurology with integrative and functional medicine. He helps people understand the root causes of brain fog, memory issues, fatigue, and hormone-related symptoms, and guides them with personalized plans built around lifestyle, nutrition, advanced testing, and long-term brain health. He works with patients who want clear answers, direct communication, and real results.
Get a clear plan for your symptoms, your goals, and the next best steps. We review your history, meds, triggers, and prior workups, then map out a plan you can follow.
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