Prospective long-term follow-up of patients with idiopathic environmental intolerance attributed to electromagnetic fields after a provocation trial

Authors: Li KH, Guo HR

Year: 2025 Sep 1

Category: Epidemiology

Journal: Ecotoxicology and Environmental Safety

DOI: 10.1016/j.ecoenv.2025.118944

URL: https://pubmed.ncbi.nlm.nih.gov/40897052/

Abstract

Overview

Previous research on idiopathic environmental intolerance attributed to electromagnetic fields (IEI-EMF) has predominantly focused on short-term follow-ups, which reported no recovery after provocation trials and a low willingness among patients to consider alternative causes for their symptoms. However, long-term data have been limited.

Methods

  • Participants of an earlier provocation trial (2010-2015) were recruited for follow-up.
  • The same questionnaire was administered via telephone interviews.
  • Out of 147 recruited, 70 completed the study: 35 IEI-EMF patients and 35 referents.

Findings

  • 60% of patients were open to alternative explanations for their symptoms.
  • 62.9% reported recovering from IEI-EMF after an average of 1.8 years; 86.4% of these recoveries were idiopathic (spontaneous).
  • Most patients experienced a decrease in symptoms and concerns related to EMFs over time, although the differences in concerns between groups were not statistically significant.
  • Compared to previous short-term studies, more patients recovered in this long-term assessment.

Conclusion

IEI-EMF appears to be self-limited in most cases when given sufficient time, with a majority eventually recovering. The findings also suggest that the majority of IEI-EMF cases may be the result of nocebo effects rather than direct EMF exposure. There is a possible therapeutic effect of provocation trials when results are negative, warranting further investigation through controlled intervention studies. Notably, participants' concerns regarding EMF as a health threat decreased over time; however, anxieties about large EMF devices in their environment persisted.

Significance

  • This study highlights a connection between EMF exposure and health concerns, particularly in individuals reporting IEI-EMF symptoms.
  • Findings may be applicable to other forms of idiopathic environmental intolerance and shed light on possible underlying psychological mechanisms, such as the nocebo effect.
IEI-EMF electromagnetic fields provocation trial long-term follow-up nocebo effect symptom recovery environmental intolerance
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