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Are thyroid dysfunctions related to stress or microwave exposure (900 MHz)?

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Bergamaschi A, Magrini A, Ales G, Coppetta L, Somma G. · 2004

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Heavy mobile phone users showed significantly altered thyroid hormone levels, suggesting potential endocrine disruption from either EMF exposure or device-related stress.

Plain English Summary

Summary written for general audiences

Italian researchers studied 2,598 mobile phone company employees to see if heavy phone use affects thyroid function. They found that workers using phones more than 33 hours per month were significantly more likely to have suppressed thyroid-stimulating hormone (TSH) levels, a marker of thyroid dysfunction. However, the researchers couldn't determine whether this effect came from the phone's electromagnetic radiation or from job-related stress.

Why This Matters

This occupational study adds important evidence to concerns about mobile phone effects on hormone regulation, particularly thyroid function. The finding that heavy users (33+ hours monthly) showed significantly altered TSH levels is noteworthy because thyroid hormones regulate metabolism, energy, and numerous bodily functions. What makes this research particularly relevant is that 33 hours monthly equals roughly one hour daily - a usage level many people exceed today with smartphones. The study's limitation in separating EMF effects from stress highlights a common challenge in EMF research, but the biological plausibility remains strong. Previous research has shown that electromagnetic fields can disrupt calcium channels in cells, which could theoretically affect hormone-producing glands like the thyroid.

Exposure Information

Specific exposure levels were not quantified in this study.

Study Details

The aim of this research was to analyse the effects of mobile phone use on thyroid function and to evaluate the possible role of occupational stress.

2598 employees (1355 men and 1243 women) with different duties (vendors, operators and network techn...

No statistically significant difference regarding TSH values below 0.4 UI/l was observed among worke...

On the basis of our data, it is not possible to establish whether this result is determined by exposure to EMF'S from mobile phones of by the stress of using these instruments.

Cite This Study
Bergamaschi A, Magrini A, Ales G, Coppetta L, Somma G. (2004). Are thyroid dysfunctions related to stress or microwave exposure (900 MHz)? Int J Immunopathol Pharmacol. 17(2 Suppl):31-36, 2004.
Show BibTeX
@article{a_2004_are_thyroid_dysfunctions_related_1901,
  author = {Bergamaschi A and Magrini A and Ales G and Coppetta L and Somma G.},
  title = {Are thyroid dysfunctions related to stress or microwave exposure (900 MHz)?},
  year = {2004},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/15345189/},
}
PubMed: 15345189

Cited By (21 papers)

View all 21 citing papers on Semantic Scholar

Quick Questions About This Study

Italian researchers found that mobile phone company employees using phones more than 33 hours monthly had significantly more suppressed thyroid-stimulating hormone levels. However, the 2004 study couldn't determine whether 900 MHz radiation or job stress caused these thyroid changes in the 2,598 workers studied.
A study of mobile phone company employees found that workers using phones more than 33 hours per month showed significantly suppressed thyroid-stimulating hormone (TSH) levels compared to lighter users. This threshold represents about 1 hour of phone conversation daily.
Research on 2,598 mobile phone company employees found significantly more workers with suppressed TSH levels among those using phones over 33 hours monthly. The study detected TSH values below 0.4 UI/l, indicating potential thyroid dysfunction from heavy phone usage.
Italian researchers studying mobile phone workers couldn't distinguish whether thyroid hormone suppression came from 900 MHz electromagnetic radiation or job-related stress. Both heavy phone use and work stress could explain the significantly higher rates of low TSH levels they observed.
The 2004 Italian study of 2,598 mobile phone company employees found significantly more workers with suppressed thyroid-stimulating hormone levels among those using phones over 33 hours monthly. However, researchers couldn't determine if 900 MHz radiation or stress caused these effects.