Fibromyalgia and Small-Fiber Neuropathy: The Overlap and upper cervical

Posted on22 August 2026,in

By Dr. Rusty Lavender — Lavender Family Chiropractic, Sarasota, FL

If you live with fibromyalgia, you already know how frustrating the condition can be to explain. The pain is everywhere and nowhere at once. Labs come back normal. Imaging looks fine. And yet the aching, burning, tingling, and exhaustion are undeniably real. For decades, people with fibromyalgia have carried the added burden of feeling as though they had to prove their pain was legitimate.

Over the past decade, a line of research has quietly shifted part of that conversation. Studies using a small skin sample — a skin biopsy — have found that a meaningful subset of people diagnosed with fibromyalgia show measurable abnormalities in their smallest nerve fibers. This finding, called small-fiber pathology or small-fiber neuropathy, doesn’t rewrite everything we understand about fibromyalgia. But it does add an important piece to the puzzle, and it offers a form of validation many patients have waited a long time to hear: in a significant portion of cases, there is something objectively measurable happening in the nervous system.

In this article, I want to walk through what small-fiber neuropathy is, what the research actually shows about its overlap with fibromyalgia, why it matters for how you think about your own care, and how this fits with the mainstream scientific model of fibromyalgia as a condition of central sensitization. I’ll also be honest about where chiropractic care fits into this picture — which is as a modest, supportive, whole-person role, coordinated with your physician, and never as a stand-alone answer.

What Fibromyalgia Actually Is

Fibromyalgia is a chronic condition defined by widespread musculoskeletal pain, often accompanied by fatigue, disrupted or unrefreshing sleep, cognitive difficulties (frequently described as “fibro fog”), and heightened sensitivity to touch, temperature, sound, and light. It affects an estimated 2 to 4 percent of the population, more commonly women, though anyone can develop it.

The most widely accepted scientific framework for fibromyalgia is central sensitization — sometimes described as central pain amplification. In a comprehensive clinical review published in JAMA, fibromyalgia is characterized as a disorder of pain regulation in which the central nervous system processes pain signals abnormally, essentially turning up the volume on sensations that would not normally be painful (Clauw, JAMA 2014). In this model, the “dial” that governs how the brain and spinal cord interpret incoming signals is set too high. A firm handshake, a snug waistband, or ordinary muscle fatigue can register as genuine pain.

This is not the same as saying the pain is imagined or psychological. Central sensitization is a real, measurable phenomenon involving changes in neurotransmitters, altered activity in pain-processing regions of the brain, and changes in how the nervous system amplifies and sustains signals. It helps explain why fibromyalgia so often travels with other conditions of altered sensory processing, such as irritable bowel syndrome, migraine, temporomandibular disorders, and interstitial cystitis. It also explains why treatments aimed purely at a single body part rarely help much — the issue is in how the whole system processes and regulates sensation.

Understanding this central-sensitization model matters, because it’s the backdrop against which the small-fiber neuropathy findings need to be interpreted. The two ideas are not in competition. As we’ll see, they may actually complement each other.

What Are Small Nerve Fibers?

To understand the research, it helps to know what small nerve fibers are and what they do.

Your peripheral nervous system contains nerve fibers of different sizes. Large, myelinated fibers carry signals for things like muscle strength, vibration sense, and position sense — the information a neurologist checks with reflex hammers and tuning forks. Small fibers are the thinly myelinated and unmyelinated nerve endings that carry different kinds of information: pain, temperature, and itch, along with the “autonomic” signals that regulate automatic body functions such as sweating, blood flow, heart rate, and blood pressure.

These small fibers include the tiny nerve endings in your skin — the epidermal nerve fibers. When they are damaged or reduced in number, the resulting condition is called small-fiber neuropathy. Its classic symptoms include burning pain, tingling, prickling, numbness, and sometimes changes in sweating, skin color, and temperature regulation. If you read that list and think it sounds a lot like some of what you experience with fibromyalgia, you’re not alone — and that overlap is exactly what caught researchers’ attention.

Small-fiber neuropathy can be measured objectively. The most established method is a skin biopsy, in which a small punch of skin (typically from the lower leg) is taken and examined under a microscope to count the density of nerve fibers in the epidermis. A reduced count — low intraepidermal nerve fiber density — is an objective marker of small-fiber pathology. Other tests, such as quantitative sensory testing and corneal confocal microscopy, can also assess small-fiber function. The key point is that these are objective, measurable findings, not subjective reports.

What the Research Says

Here is where the story gets genuinely interesting. Beginning around 2013, several independent research groups asked a simple question: if we take people who meet the criteria for fibromyalgia and examine their small nerve fibers, what do we find?

The answers, published in respected peer-reviewed journals, were remarkably consistent.

One influential study examined adults diagnosed with fibromyalgia and found that roughly half had objective evidence of small-fiber polyneuropathy on skin biopsy and related testing. The authors framed this pointedly, suggesting that some illness currently labeled as fibromyalgia may in fact be an under-recognized small-fiber neuropathy with an identifiable, testable basis (Oaklander et al., Pain 2013). This was a striking claim, because it implied that for a subset of patients, there was a definable nerve abnormality hiding underneath the fibromyalgia label.

Around the same time, a German research group published a careful study using skin biopsy, quantitative sensory testing, and nerve recordings. They too found evidence of small-fiber impairment in people with fibromyalgia compared with healthy participants, documenting both reduced nerve fiber density and abnormal functional measures (Üçeyler et al., Brain 2013). Importantly, this study came from a different country, used somewhat different methods, and still arrived at a convergent conclusion — a hallmark of a finding worth taking seriously.

A third group, publishing in a leading rheumatology journal, specifically examined epidermal nerve fiber density in fibromyalgia patients and again documented abnormally reduced nerve fiber density compared with controls (Caro & Winter, Arthritis & Rheumatology 2014). The accumulation of independent replications, using the objective skin-biopsy method, moved this from a one-off curiosity toward an established observation.

But how common is it, really? Individual studies can vary, and it’s easy to over-read a single dramatic result. To answer that, researchers pooled the available data in a systematic review and meta-analysis — the kind of study that combines many investigations to estimate an overall figure. This analysis concluded that small-fiber pathology is present in roughly half of fibromyalgia patients across the studies examined, a prevalence far higher than would be expected by chance (Grayston et al., Seminars in Arthritis and Rheumatism 2019). That’s the source of the commonly cited “about 40 to 50 percent” figure. It’s a genuine, reproducible signal.

So the headline is this: a substantial subset — on the order of 40 to 50 percent — of people diagnosed with fibromyalgia have measurable small-fiber nerve pathology. That is a real, peer-reviewed, replicated finding.

Now for the equally important caveats, because honest framing matters more than a dramatic headline.

What the Research Does Not Say

It would be easy to read the studies above and conclude that fibromyalgia has been “solved” or reclassified as a nerve disease. It has not, and the researchers themselves are careful about this. A few points of nuance are essential.

First, it’s a subset, not everyone. If roughly half of fibromyalgia patients show small-fiber pathology, then roughly half do not. The finding is important precisely because it identifies a distinct group — but it does not explain every case, and it does not replace the broader diagnosis for most people.

Second, correlation is not the same as cause. Finding reduced nerve fiber density in someone with fibromyalgia tells us the two things co-occur. It does not, by itself, prove that the small-fiber changes cause the widespread pain, fatigue, sleep problems, and cognitive symptoms that define fibromyalgia. Small-fiber pathology might be a driver of symptoms in some people, a parallel process in others, or a downstream consequence. The science is still working this out.

Third, the central-sensitization model still stands. The widespread pain, the heightened sensitivity across many body systems, the fatigue and cognitive symptoms, and the strong overlap with other central sensitivity conditions are most fully explained by altered central nervous system pain processing, as described in the JAMA clinical review (Clauw, JAMA 2014). Small-fiber findings add to this picture; they don’t overturn it. In fact, one plausible interpretation is that in some patients, ongoing signals from irritated small fibers in the periphery may feed into and help sustain a centrally sensitized nervous system — the two mechanisms reinforcing each other rather than competing.

Fourth, and most important for a chiropractic office to say plainly: none of this research validates any specific manual therapy. These studies are about nerve biology and diagnosis. They say nothing about chiropractic, spinal adjustment, or any hands-on treatment. It would be misleading for anyone to point to the small-fiber neuropathy literature as evidence that a particular therapy — including ours — treats, reverses, or fixes the underlying nerve changes. It does not, and I won’t suggest otherwise.

Fifth, methods and thresholds still vary between studies. Different research teams have used somewhat different biopsy sites, staining techniques, and cutoff values for what counts as “reduced” nerve fiber density, and the exact percentage of patients affected shifts depending on those choices and on the population studied. This is normal for an evolving area of science, and it’s part of why researchers rely on meta-analysis to estimate an overall figure rather than leaning on any single study. It also means the “40 to 50 percent” number is a reasonable central estimate, not a precise, fixed value that applies identically to every clinic or every patient group.

Why the Overlap Still Matters to You

If the small-fiber findings don’t change most diagnoses and don’t validate manual therapy, why bring them up at all? Because they matter in several very practical ways.

Validation. Many people with fibromyalgia have spent years being told, subtly or directly, that their pain isn’t real or isn’t explainable. Knowing that objective nerve abnormalities are measurable in a large share of cases can be genuinely reassuring. Your experience is real, and science increasingly reflects that.

Possible diagnostic clarity. If you have prominent burning pain, tingling, numbness, or autonomic symptoms such as unusual sweating, lightheadedness on standing, or temperature-regulation problems, that pattern may prompt your physician to consider testing for small-fiber neuropathy. When small-fiber neuropathy is identified, it opens the door to searching for treatable underlying causes — such as diabetes and prediabetes, thyroid disease, vitamin B12 deficiency, certain autoimmune and inflammatory conditions, and others. Some of these causes have specific medical treatments. That’s a conversation for your physician, rheumatologist, or neurologist, but the small-fiber lens can meaningfully change the diagnostic path for the right patient.

Better conversations with your care team. When you understand that fibromyalgia can involve both peripheral nerve changes and central pain amplification, you can ask sharper questions and describe your symptoms more precisely. Telling your physician “my feet burn at night and I get dizzy when I stand” is different from saying “I hurt all over.” Both may be true, but the first description is the kind that can prompt targeted testing and a more individualized plan. Being an informed, specific advocate for yourself is one of the most useful things you can do with this information.

A more complete model of your nervous system. Whether or not you ever have a biopsy, the overlap reinforces a useful way of thinking about fibromyalgia: it is fundamentally a nervous-system condition — involving how nerves signal at the periphery and how the brain and spinal cord process those signals centrally. That framing helps explain why approaches that calm and support the nervous system as a whole, and why coordinated, whole-person care, tend to matter more than chasing pain in one isolated spot.

Where Chiropractic Fits — Honestly

This is the part where I want to be especially careful and clear, because you deserve straight talk rather than marketing.

The evidence for chiropractic care in fibromyalgia is limited. There is no strong body of research showing that chiropractic adjustments treat fibromyalgia, reverse small-fiber neuropathy, or change the underlying central sensitization in a lasting way. Anyone who tells you otherwise is getting ahead of the science. I’m not going to do that.

So what is the honest role, if any, for a practice like ours?

I see it as adjunctive and supportive — one part of a broader, physician-coordinated plan, aimed at whole-person comfort and nervous-system calming rather than a cure. Here’s what that means in practice.

Fibromyalgia involves a nervous system that is, in a sense, stuck in a heightened, guarded, threat-detecting state. Much of good fibromyalgia care — gentle graded exercise, better sleep, stress reduction, paced activity, and supportive therapies — works by gradually helping the nervous system feel safer and less on high alert. Within that framework, gentle, low-force chiropractic care may offer some people a measure of comfort, reduced muscle guarding, and a calmer sense of their body. That is a modest goal, and I state it modestly.

At Lavender Family Chiropractic, our focus is upper cervical care, which centers on the top of the neck where the head meets the spine. Our approach is deliberately gentle. The upper cervical technique we use — a low-force method sometimes called Knee Chest Upper Cervical — is precise, gentle, and low-force, with no twisting, cracking, or popping. For someone whose nervous system is already sensitized and easily overwhelmed, a low-force approach is often more appropriate and more comfortable than forceful manipulation.

To guide care thoughtfully and avoid guesswork, we use objective tools:

3D CBCT imaging (cone-beam computed tomography) to see the detailed anatomy of the upper cervical region, so any care is tailored to your individual structure rather than assumptions.
Paraspinal infrared thermography, which measures patterns of heat along the spine that can reflect autonomic nervous-system activity — a way to observe and track how your nervous system is responding over time.

I want to be precise about what these tools are and are not. They help us understand your anatomy and monitor nervous-system patterns, and they let us make careful, individualized decisions. They are not a test for fibromyalgia or small-fiber neuropathy, and they do not diagnose those conditions. Diagnosis of fibromyalgia and any nerve pathology belongs with your physician and, when appropriate, a neurologist or rheumatologist.

The bottom line: if gentle upper cervical care helps you feel calmer, more comfortable, and better supported alongside your medical treatment, that’s a worthwhile adjunctive role. It is not a replacement for medical care, and it is not a cure.

What a First Visit With Us Looks Like

Because I’ve emphasized honesty, it’s worth describing what actually happens if you come in, so there are no surprises. A first visit begins with a thorough conversation about your health history, your symptoms, your current medical care, and your goals. We want to understand the whole picture, including who else is on your care team.

If it seems reasonable to proceed, we may perform an examination and use our objective tools — 3D CBCT imaging of the upper cervical region and paraspinal infrared thermography — to understand your individual anatomy and observe how your nervous system is behaving. We’ll explain what we see in plain language. If gentle, low-force care appears appropriate, we’ll describe exactly what it would involve and what modest goals we’d be aiming for. And if we don’t think care is a good fit, or if something in your history suggests you should see your physician first, we’ll tell you that directly. Referring you elsewhere when that’s the right call is part of doing this honestly.

A Whole-Person, Coordinated Approach

The most credible thing I can tell you about fibromyalgia care is that no single treatment carries the load. The strongest results tend to come from combining several supportive strategies, coordinated across your care team. That typically includes:

Your physician or rheumatologist as the medical hub — for accurate diagnosis, evaluation for underlying causes (including the small-fiber and metabolic causes discussed above), and evidence-based medical management, which may include specific medications for pain regulation and sleep.
Graded physical activity, one of the most consistently supported approaches. Gentle, gradually increased movement — walking, water-based exercise, tai chi, yoga — helps recalibrate an oversensitive nervous system over time. The key is starting low and building slowly to avoid flares.
Sleep and stress support. Because unrefreshing sleep and stress amplify fibromyalgia symptoms, addressing them is central rather than optional.
Psychological and behavioral support such as cognitive behavioral therapy, which has evidence for helping people manage chronic pain and its impact — not because the pain is “in your head,” but because the brain’s pain-processing systems are directly involved.
Adjunctive supportive care, which is where a gentle, low-force chiropractic approach can play a modest role for those who find it helpful.

The theme running through all of this is the nervous system. When you understand fibromyalgia as a condition of how nerves signal and how the brain processes those signals — peripherally and centrally — the logic of a calm, patient, whole-person approach becomes clear.

Red Flags: When to Seek Prompt Medical Attention

Fibromyalgia is a real diagnosis, but it should never become a catch-all that causes other conditions to be missed. Please seek prompt medical evaluation — not chiropractic care — if you experience any of the following. These can signal conditions that require timely medical attention.

New, progressive, or severe weakness in the arms or legs, or loss of coordination.
Numbness in the “saddle” region (inner thighs, groin, buttocks), or new loss of bladder or bowel control — this can be a medical emergency.
Sudden, severe headache unlike any you’ve had before, or a headache with fever, stiff neck, confusion, or vision changes.
Symptoms of stroke: sudden facial drooping, arm weakness, difficulty speaking, sudden vision loss, or severe imbalance. Call 911 immediately.
Unexplained weight loss, fevers, or night sweats accompanying your pain.
Rapidly worsening burning pain, numbness, or autonomic symptoms (such as fainting, marked changes in sweating, or new digestive problems), which warrant medical workup for neuropathy and its causes.
Pain following significant trauma, such as a fall or car accident.

None of these should be assumed to be “just fibromyalgia.” When in doubt, contact your physician or seek emergency care.

Putting It All Together

The overlap between fibromyalgia and small-fiber neuropathy is one of the more meaningful developments in this field in recent years. The research — published in respected journals, replicated by independent groups, and summarized in a formal meta-analysis — shows that roughly 40 to 50 percent of people diagnosed with fibromyalgia have objective, measurable small-fiber nerve pathology on skin biopsy (Oaklander 2013; Üçeyler 2013; Caro & Winter 2014; Grayston 2019).

That finding validates what so many patients have long known — that their pain is real and rooted in the nervous system. It can open doors to diagnostic clarity and, for some, to treatable underlying causes. And it fits comfortably alongside, rather than against, the well-established central-sensitization model of fibromyalgia (Clauw 2014).

What it does not do is hand any chiropractor a reason to overpromise. The honest position is that chiropractic care has limited evidence in fibromyalgia and belongs in a modest, adjunctive, supportive role — coordinated with your medical team, focused on comfort and nervous-system calming, and never presented as a cure. That’s the standard we hold ourselves to, and it’s the standard you should hold any provider to.

If you’re living with fibromyalgia, my hope is that you leave this article with two things: a clearer, more hopeful understanding of what may be happening in your body, and a healthy skepticism toward anyone promising more than the science supports.

Serving Sarasota and the Surrounding Communities

Lavender Family Chiropractic (NeckWise North Sarasota) proudly serves patients throughout Sarasota, North Sarasota, Bradenton, Whitfield, Palmetto, University Park, Lakewood Ranch, Ellenton, and the surrounding Manatee and Sarasota County communities.

If you’re managing fibromyalgia and are curious whether gentle, low-force upper cervical care might have a supportive role alongside your medical treatment, we’d be glad to talk it through with you honestly. We offer a complimentary consultation with our doctors, where we’ll listen to your story, explain what we can and cannot offer, and help you understand how care would coordinate with your physician or rheumatologist.

Lavender Family Chiropractic (NeckWise North Sarasota) 5899 Whitfield Avenue, Suite 107 Sarasota, FL 34243(941) 243-3729

This article is for general educational purposes only and is not medical advice. It is not intended to diagnose, treat, or replace care from your physician. Fibromyalgia and small-fiber neuropathy require evaluation and management by a qualified medical provider. Always consult your physician about your individual health, and seek prompt or emergency care for any of the red-flag symptoms described above.