Researchers: why gluten can be associated with migraines, ischemic stroke, epilepsy, and other neurological manifestations

Editorial note

This article was previously published and has been updated according to scientific and divulgative criteria to reflect recent literature and available reviews. The text is for informational purposes only and does not replace medical advice. In case of suspected celiac disease, gluten sensitivity, or neurological symptoms, consult your doctor or trusted specialist for personalized diagnostic and therapeutic evaluations.

IN BRIEF

• Celiac disease and gluten sensitivity are associated with not uncommon neurological manifestations, including migraine, epilepsy, and neuroradiological abnormalities.
• Evidence is mostly observational or case reports; in some patients, a gluten-free diet (GFD) has reduced neurological symptoms, but causality is not established in all cases.
• Plausible mechanisms exist involving intestinal inflammation, autoimmune reactions, and altered intestinal-blood-brain barrier permeability.
• The risk of stroke associated with celiac disease appears modest and variable: some cohorts show a slight short-term increase, while others do not detect a clinically significant long-term increase.
• Clinical decisions must be individualized: diagnosis requires serological tests and histological confirmation when indicated.

Abstract: what does science say?

Gluten is a family of proteins found in wheat, rye, and barley. In celiac disease (CD), an immune response to gluten damages the intestinal lining; there are also forms of non-celiac gluten sensitivity. Available evidence shows associations between gluten-related disorders and neurological symptoms: migraine is more frequent in populations with CD; in some patients with CD or sensitivity, epilepsy, focal or diffuse neuroradiological brain lesions, autoimmune ataxia, and thrombosis are observed. Studies include reviews, cohorts, and case series: many results are observational, and the strength of the association varies depending on the population, diagnostic method, and follow-up time. In some cases, a gluten-free diet has led to improvements, but the response is heterogeneous. The main limitations are methodological heterogeneity, possible confounders (e.g., nutritional deficiencies), and a low prevalence of serious events. Biological plausibility involves immune activation, neuronal antibodies, and altered intestinal barrier; however, direct causal evidence is incomplete. Therefore, clinical interpretation must be cautious and based on specialist evaluation.

What are gluten and celiac disease: definitions and diagnosis

The term "gluten" refers to proteins found in wheat, rye, and barley. In celiac disease (CD), the ingestion of gluten in genetically predisposed individuals triggers an immune response that can damage the small intestinal mucosa and lead to malabsorption and both intestinal and systemic symptoms. There are also forms defined as "non-celiac gluten sensitivity" with variable manifestations and without the mucosal lesion typical of CD; the clinical and diagnostic role of these forms is still under study [1].

The diagnosis of CD is based on serological tests (e.g., anti-tissue transglutaminase antibodies) and, when indicated, on histological confirmation by duodenal biopsy. The first diagnostic step is therefore an appropriate clinical and laboratory evaluation: blood tests, nutritional assessment, and possibly endoscopy with biopsy. It is important not to start a gluten-free diet before the tests, as this can make the tests less reliable [1].

The link between gluten and migraine: what the research shows

Numerous observational studies and systematic reviews have highlighted an increased prevalence of headaches and, in particular, migraines in people with celiac disease compared to the general population. A meta-analysis of systematic reviews estimated a significant prevalence of headache in patients with CD and suggests that, especially in children, screening for CD in cases of idiopathic headache may be considered [2].

Some case studies report that in celiac patients with migraine, a gluten-free diet (GFD) reduced the frequency and intensity of attacks; however, the effect is not uniform, and studies differ in design and sample size. Furthermore, the relationship seems to depend on comorbid factors (for example, nutritional deficiencies, absorption disorders, and other immune disorders), the duration of gluten exposure, and adherence to the diet [2].

In summary: the association between CD/gluten sensitivity and migraine is supported by observational studies but does not automatically prove causality for all patients; the response to GFD exists in selected subgroups and requires adequate diagnostic evaluations and follow-up [2].

Gluten, epilepsy, and neuroradiological abnormalities

Clinical associations have been described between CD or gluten sensitivity and various neurological syndromes, including forms of epilepsy, sometimes related to occipital calcifications or other neuroradiological abnormalities. A systematic review has compiled studies indicating a higher prevalence of epilepsy in patients with CD and, conversely, an increased prevalence of CD in some populations with resistant epilepsy [3].

Neuroradiological studies have documented, in case series of patients with CD, the presence of white matter lesions and cerebral calcifications in some cases; a prospective study on pediatric patients is among the first reports to identify white-matter lesions in subjects with CD treated with GFD [4].

Gluten-free dietary therapy has shown clinical improvements or remission of seizures in some case series, but the evidence primarily consists of observational studies or non-randomized clinical reports. Therefore, the possibility that gluten removal improves epileptic response in some patients is plausible, but not generalizable to all cases of epilepsy [3][4].

Gluten, Coagulation, and Cerebrovascular Risk

The relationship between CD and the risk of thrombotic events or ischemic stroke has been studied with not entirely consistent results. A large-scale cohort study in Sweden showed a small increase in stroke risk in people with CD, especially in the first years after diagnosis, with effects diminishing over time [5].

Other works and reviews of clinical cases have described episodes of cerebral venous thrombosis, portal thrombosis, and other thrombotic events in association with CD; possible explanations include hyperhomocysteinemia due to vitamin deficiencies, hypercoagulable states linked to comorbidities and autoimmunity, and systemic inflammatory alterations [6].

In conclusion: a plausible association exists between CD and some types of thrombotic events, but the absolute risk generally remains low, and clinical relevance depends on the individual context. Larger and controlled studies are needed to define the extent and mechanisms of this link [5][6].

Gluten and neurodegenerative diseases: what the data says about ALS

Isolated reports and case studies have suggested that, in rare cases, neurological manifestations associated with CD may mimic motor neuron diseases; however, epidemiological analyses and large-scale studies do not confirm a solid association between gluten sensitivity or CD and motor neuron disease (ALS). A case-control study in European populations found no serological, genetic, or anamnestic evidence to support a causal link between gluten and ALS [8].

This means that, apart from occasional clinical reports, there is insufficient evidence to consider gluten a causal factor in most cases of ALS. Exceptions, as always in clinical practice, require detailed and multidisciplinary evaluation [8].

Plausible biological mechanisms

The most studied mechanistic hypotheses concern: systemic immune activation originating from the gut, production of autoantibodies (in some cases anti-gliadin or anti-TG6) with cross-reactivity to neuronal antigens, increased intestinal permeability and, in part, of the blood-brain barrier, and local inflammatory processes in the central nervous system. Recent neuropathological studies on cerebella of patients with gluten ataxia show evidence of inflammation and microglial activation, strengthening the biological plausibility of immune-mediated damage [7][6].

What this means in practice

For the reader: evidence indicates that in some patients, the presence of celiac disease or gluten sensitivity may be associated with relevant neurological disorders, but most associations come from observational studies, case series, and reviews. This translates into some practical principles:

• If a person experiences recurrent migraines, new-onset epilepsy, or unexplained neurological signs, clinical evaluation may include screening for celiac disease (serological tests) when the clinical history suggests it; do not start a gluten-free diet before the correct diagnostic process if accurate diagnostic confirmation is desired [2][1].
• GFD can reduce neurological symptoms in some patients with documented CD or gluten sensitivity, but it is not a guarantee for everyone. Dietary decisions should be made with a doctor and, if necessary, with a specialized nutritionist to avoid nutritional deficiencies [3][4].
• For serious events such as stroke or cerebral thrombosis, the presence of CD may be one of the factors to evaluate along with other risk factors; management remains multidisciplinary and focused on treating the event and correcting predisposing factors (e.g., vitamin deficiencies) [6][5].
• In the absence of evidence of documented CD or sensitivity, it is not advisable to follow a gluten-free diet as a preventive strategy for neurological conditions; choosing to eliminate gluten without indications can complicate diagnosis and lead to nutritional risks.

Key Takeaways

1. Celiac disease can have neurological manifestations: migraine, epilepsy, ataxia, and neuropathy are the most commonly described.
2. The association between gluten and thrombotic events/stroke is documented, but the absolute risk is generally low and variable.
3. In some patients, a gluten-free diet improves neurological symptoms, but the evidence is not uniform and does not prove universal causality.
4. Accurate diagnosis requires serological tests and, when indicated, histological confirmation; do not start a GFD before testing if seeking a definitive diagnosis.
5. Therapeutic decisions must be personalized and conducted with specialists (gastroenterologist, neurologist, nutritionist).

Limitations of the Evidence

It is important to distinguish between observed association and proof of causality. Many available studies are observational, retrospective, or case reports, which may highlight a temporal link or correlation but are subject to bias and confounding factors. Some common limitations include: diagnostic heterogeneity (different criteria for CD and gluten sensitivity), small sample sizes, limited follow-up, and the absence of randomized controlled trials for neurological manifestations.

Systematic reviews and larger cohorts provide useful information, but often show variable results depending on age, dietary adherence, diagnostic methods, and the presence of other autoimmune diseases. For example, the excess risk of stroke reported in some cohorts tends to be concentrated in the period immediately after diagnosis and attenuates over time [5].

To better understand causal relationships, well-designed prospective studies are needed, with standardized diagnostic definitions, appropriate controls, and measurements of biological indicators (neuronal antibodies, inflammatory markers, neuroradiological data) correlated with clinical follow-up [3][6].

Editorial Conclusion

Contemporary literature supports the idea that the relationship between gluten, celiac disease, and the nervous system is real and clinically relevant for a subset of patients. However, the strength of the evidence varies depending on the manifestation considered: for migraines and epileptic manifestations, observational data and reviews suggest associations and, in some cases, benefit from a GFD; for stroke and thrombosis, the evidence indicates weaker and contextual associations. For neurodegenerative diseases like ALS, there is currently no robust epidemiological support for a direct role of gluten.

In clinical practice, management should be based on accurate diagnoses, a multidisciplinary approach, and caution in interpreting associations as proof of causality. Future research should prioritize prospective and mechanistic studies to clarify who can truly benefit from a gluten-free diet and why.

Final Editorial Note

This update has been prepared with criteria of rigor and transparency, valuing verifiable references and clearly distinguishing between observational evidence and causal proof. The article is informative: for any clinical decision, consult a qualified healthcare professional.

SCIENTIFIC RESEARCH

Below are the research studies cited in the article (order corresponds to citations in the text). Click on the DOIs to access the original sources.

1. Gala D, Scharf S, Kudlak M, et al. A Comprehensive Review of the Neurological Manifestations of Celiac Disease and Its Treatment. Diseases. 2022. https://doi.org/10.3390/diseases10040111
2. Zis P, Julian T, Hadjivassiliou M. Headache Associated with Coeliac Disease: A Systematic Review and Meta‑Analysis. Nutrients. 2018. https://doi.org/10.3390/nu10101445
3. Julian T, Hadjivassiliou M, Zis P. Gluten sensitivity and epilepsy: a systematic review. Journal of Neurology. 2019. https://doi.org/10.1007/s00415-018-9025-2
4. Kieslich M, Errazuriz G, Posselt HG, et al. Brain white‑matter lesions in celiac disease: a prospective study of 75 diet‑treated patients. Pediatrics. 2001;108(2):e21. https://doi.org/10.1542/peds.108.2.e21
5. Ludvigsson JF, West J, Card T, Appelros P. Risk of Stroke in 28,000 Patients with Celiac Disease: A Nationwide Cohort Study in Sweden. Journal of Stroke & Cerebrovascular Diseases. 2012. https://doi.org/10.1016/j.jstrokecerebrovasdis.2011.05.008
6. Pantic N, Pantic I, Jevtic D, et al. Celiac Disease and Thrombotic Events: Systematic Review of Published Cases. Nutrients. 2022;14(10):2162. https://doi.org/10.3390/nu14102162
7. "Cerebellar degeneration in gluten ataxia is linked to microglial activation." Brain Communications. 2024;6(2):fcae078. https://doi.org/10.1093/braincomms/fcae078
8. van den Berg LH, Pazoki R, Pulit SL, et al. No association between gluten sensitivity and amyotrophic lateral sclerosis. Journal of Neurology. 2017. https://doi.org/10.1007/s00415-017-8400-8