Gut Microbiota Interactions in Autoimmune Thyroid Disorders

The human gut microbiota exerts a profound influence on thyroid health through a bidirectional network often termed the gut–thyroid axis. In autoimmune thyroid disorders such as Hashimoto’s thyroiditis and Graves’ disease, alterations in microbial diversity and composition—collectively referred to as dysbiosis—are linked to immune dysregulation, impaired micronutrient absorption and increased intestinal permeability. Key microbial metabolites, notably short-chain fatty acids, modulate regulatory T-cell function and cytokine production, thereby shaping systemic autoimmunity. Conversely, thyroid hormone fluctuations can reshape microbial communities by altering gastrointestinal motility and mucosal immunity. Animal models further illuminate mechanistic pathways, revealing interplay between innate immune sensors in the gut epithelium and thyroid hormone synthesis. Clinically, this evolving understanding points to the development of microbiome-targeted interventions—ranging from dietary prebiotics and probiotics to bespoke faecal microbiota transplantation—to complement conventional therapies and personalise disease management.

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Gut Microbiota Interactions in Autoimmune Thyroid Disorders publication trend

The graph below shows the total number of articles in gut microbiota interactions in autoimmune thyroid disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Gut–thyroid axis: Reciprocal communication network between intestinal microbes and thyroid function that influences hormone synthesis and immune regulation.

Dysbiosis: Disruption of the normal balance, diversity or composition of the gut microbial community.

Short-chain fatty acids (SCFAs): Metabolites produced by bacterial fermentation of dietary fibres that modulate host immune responses.

Prebiotics: Non-digestible dietary substrates that selectively stimulate the growth or activity of beneficial gut microorganisms.

Mendelian randomisation: Genetic epidemiology method using inherited variants as proxies to infer causal relationships between exposures (e.g. microbes) and disease outcomes.

References

1. The relationship between thyroid and human-associated microbiota: A systematic review of reviews. Reviews in Endocrine and Metabolic Disorders (2023).
2. Yijung-tang improves thermogenesis and reduces inflammation associated with gut microbiota in hypothyroid rats. npj Biofilms and Microbiomes (2023).
3. A cause–effect relationship between Graves’ disease and the gut microbiome contributes to the thyroid–gut axis: A bidirectional two-sample Mendelian randomization study. Frontiers in Immunology (2023).