Negative Celiac Test but Burning Feet? The Gluten–Neuropathy Link Doctors Miss

You did the responsible thing. You mentioned your burning feet, someone ordered a celiac panel, it came back negative, and gluten was crossed off the list. But for a large number of people with gluten-related nerve damage, that negative result is exactly where the diagnosis goes wrong. The celiac test is answering a different question than the one your nerves are asking. This article explains why standard celiac screening misses gluten neuropathy, and what testing actually reveals it.

The celiac test answers the wrong question

Celiac disease is defined by an immune attack on the small intestine. Its screening tools are built to detect that — chiefly antibodies to tissue transglutaminase-2 (tTG-2), the transglutaminase isoform concentrated in the gut, confirmed by intestinal biopsy showing damage to the villi.

Gluten-related neurological disease is a different manifestation of gluten sensitivity. The immune response targets the nervous system, and the gut may be entirely spared. A patient can therefore have a pristine celiac panel and normal intestinal biopsy while producing the antibodies that are injuring their peripheral nerves. The test isn’t broken — it’s simply looking in the wrong place.

What the immune system actually targets in the nerves

As covered in the companion article on the gluten–neuropathy connection, the mechanism is molecular mimicry. Two targets are especially relevant to a nerve-focused workup.

Transglutaminase-6 (TG6). This isoform is expressed in nervous tissue, and antibodies against it — described by Dr. Marios Hadjivassiliou’s group — mark the neurological form of gluten sensitivity. TG6 antibodies can be present when the gut-focused tTG-2 antibodies are absent, which is precisely why a celiac screen can miss neurological disease.

Anti-myelin and related antibodies. The immune response can also target components of the myelin sheath that insulates nerves, contributing to the sensory neuropathy and, when the cerebellum is involved, the ataxia seen in gluten-related neurological disease.

The genetics: HLA-DQ2 and HLA-DQ8

Gluten sensitivity has a strong genetic underpinning. The great majority of people who react to gluten — whether the celiac or the neurological form — carry one of two immune-system genetic markers, HLA-DQ2 or HLA-DQ8. Testing for these haplotypes is informative in a different way than antibody testing: a negative HLA-DQ2/DQ8 result makes gluten-driven disease very unlikely and can effectively rule it out, while a positive result establishes susceptibility (though not everyone who is susceptible develops disease). This makes HLA typing a useful gatekeeping test in an unexplained neuropathy workup.

Building a proper gluten-neuropathy panel

For someone with an unexplained sensory neuropathy — especially with any balance disturbance — a more complete evaluation than a routine celiac screen includes HLA-DQ2/DQ8 genetic typing, an expanded gluten-related antibody panel (including TG6 where available, alongside the conventional celiac antibodies), and a clinical assessment for the length-dependent sensory pattern and any cerebellar signs. The aim is to catch the neurological form that the standard screen is not designed to see.

An important practical caveat: antibody testing is most meaningful while gluten is still in the diet. If a patient has already gone gluten-free, antibody levels may fall and produce falsely reassuring results — something to plan around with a clinician before testing.

Why it’s worth the effort

Chasing down a gluten contribution is worthwhile because, unlike many drivers of neuropathy, it is entirely removable — the trigger is dietary. When gluten-related neurological disease is confirmed and strict elimination is undertaken early, symptoms can stabilize and sometimes improve. The tragedy of the missed diagnosis is that the person keeps eating the trigger for years, attributing their progressive nerve damage to bad luck or aging, when a change on the plate could have changed the trajectory.

This is one driver among several

Gluten sensitivity is one possible contributor evaluated within a broader root-cause investigation that also weighs metabolic, toxic, and mechanical causes. Because multiple drivers frequently coexist, ruling gluten in or out is part of assembling the complete picture rather than a search for a single culprit.

Frequently asked questions

Key takeaways

• Standard celiac tests detect intestinal disease, not the neurological form of gluten sensitivity.
• Transglutaminase-6 (TG6) antibodies mark the neural attack and can be present with a negative celiac panel.
• HLA-DQ2/DQ8 typing is a useful gatekeeper: a negative result largely rules gluten out.
• Test while still eating gluten, since prior elimination can produce falsely negative antibodies.
• Confirmed gluten neuropathy is uniquely treatable, because the trigger is removable.

Medically reviewed by Gurpreet Singh Padda, MD — Board certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed July 2026.

This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not make major dietary or medication changes without consulting your physician. Take the free Nerve Damage Score or call/text (314) 886-5902.

References

1. Hadjivassiliou M, et al. Transglutaminase-6 antibodies in the diagnosis of gluten ataxia. Neurology. 2013;80:1740–1745.
2. Hadjivassiliou M, Sanders DS, Grünewald RA, et al. Gluten sensitivity: from gut to brain. Lancet Neurol. 2010;9:318–330.
3. Hadjivassiliou M, et al. Gluten-related neurological dysfunction and HLA associations.
4. Volta U, et al. Serological tests in gluten-related disorders. Cell Mol Immunol / review.