Microplastics in Thyroid: Emerging Environmental Risks

Researchers recently identified microplastics in thyroid tissues for the first time. This study highlights a concerning association between these environmental pollutants and autoimmune thyroiditis (AIT). Notably, AIT remains the leading cause of hypothyroidism globally. Consequently, understanding environmental triggers like plastic accumulation is vital for modern endocrinology.

PVC Microplastics in Thyroid Health

The case-control study examined thyroid tissues from 29 AIT patients and 29 healthy controls. Notably, the AIT group exhibited a ten-fold higher concentration of microplastics. Specifically, polyvinyl chloride (PVC) was significantly more prevalent in those with thyroid autoimmunity. Therefore, researchers suggest that PVC might actively contribute to glandular inflammation. Furthermore, micro-Raman spectroscopy identified particles ranging from 33.9 to 1467 µm in size.

Implications for Endocrine Function

Environmental microplastics enter the body through ingestion and inhalation. Because the thyroid is highly vascularized, it likely accumulates these particles over time. In addition, the study found 172 items per gram in the AIT group compared to only 50.2 in controls. Although morphology was similar between groups, the total burden differed greatly. Consequently, medical experts are calling for more epidemiological studies to assess long-term health impacts.

Frequently Asked Questions

How do microplastics in thyroid tissues affect health?

Accumulated microplastics can trigger inflammatory responses and oxidative stress. In the thyroid, this may lead to immune dysregulation and the development of autoimmune thyroiditis.

Which type of plastic is most common in thyroid patients?

The study found that patients with autoimmune thyroiditis had significantly higher levels of polyvinyl chloride (PVC) compared to healthy individuals.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

1. Yu ST et al. Preliminary Evidence of Microplastics in the Human Thyroid and Their Potential Association with Autoimmune Thyroiditis. Thyroid. 2026 Apr 10. doi: 10.1177/10507256261442506. PMID: 41961540.


2. Campanale C et al. A Detailed Review Study on Potential Effects of Microplastics and Additives of Concern on Human Health. Int. J. Environ. Res. Public Health 2020, 17, 1212.


3. Garg R. Small particles, big impact: A narrative review of microplastics and their effects on thyroid function. Environmental Disease. 2026;10(4):105-112.