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

Ecotoxicology and Environmental Safety · 2025 · No effect · Low evidence

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No effectLow evidencePaper 2549

Study snapshot

PublicationEcotoxicology and Environmental Safety · 2025

Study typecohort

Reported directionNo effect

Evidence ratingLow

Abstract

Category: Epidemiology Tags: IEI-EMF, electromagnetic fields, provocation trial, long-term follow-up, nocebo effect, symptom recovery, environmental intolerance DOI: 10.1016/j.ecoenv.2025.118944 URL: pubmed.ncbi.nlm.nih.gov 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.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typecohort

Effect directionno_effect

PopulationParticipants from an earlier provocation trial (2010–2015): IEI-EMF patients and referents

Sample size70

Exposurelong-term follow-up after earlier provocation trial (2010–2015); mean recovery time reported as 1.8 years

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Among 70 completers (35 IEI-EMF patients, 35 referents), 60% of patients were open to alternative explanations for symptoms. 62.9% of patients reported recovering from IEI-EMF after an average of 1.8 years, with 86.4% of recoveries described as idiopathic (spontaneous). Most patients reported decreased symptoms and decreased EMF-related concerns over time, though between-group differences in concerns were not statistically significant.

Outcomes measured

Recovery from IEI-EMF
Openness to alternative explanations for symptoms
Symptom levels over time
Concerns related to EMFs over time
Perceived EMF as a health threat/anxiety about large EMF devices

Limitations

Long-term follow-up relied on telephone questionnaire/self-report
Substantial attrition/non-completion (70/147 completed)
Exposure characteristics (frequency/source/intensity) not described in the abstract
Not a controlled intervention study for therapeutic effects; suggestion of provocation-trial therapeutic effect is not tested here

View raw extracted JSON

{
  "study_type": "cohort",
  "exposure": {
    "band": null,
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "long-term follow-up after earlier provocation trial (2010–2015); mean recovery time reported as 1.8 years"
  },
  "population": "Participants from an earlier provocation trial (2010–2015): IEI-EMF patients and referents",
  "sample_size": 70,
  "outcomes": [
    "Recovery from IEI-EMF",
    "Openness to alternative explanations for symptoms",
    "Symptom levels over time",
    "Concerns related to EMFs over time",
    "Perceived EMF as a health threat/anxiety about large EMF devices"
  ],
  "main_findings": "Among 70 completers (35 IEI-EMF patients, 35 referents), 60% of patients were open to alternative explanations for symptoms. 62.9% of patients reported recovering from IEI-EMF after an average of 1.8 years, with 86.4% of recoveries described as idiopathic (spontaneous). Most patients reported decreased symptoms and decreased EMF-related concerns over time, though between-group differences in concerns were not statistically significant.",
  "effect_direction": "no_effect",
  "limitations": [
    "Long-term follow-up relied on telephone questionnaire/self-report",
    "Substantial attrition/non-completion (70/147 completed)",
    "Exposure characteristics (frequency/source/intensity) not described in the abstract",
    "Not a controlled intervention study for therapeutic effects; suggestion of provocation-trial therapeutic effect is not tested here"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "IEI-EMF",
    "idiopathic environmental intolerance",
    "electromagnetic fields",
    "provocation trial",
    "long-term follow-up",
    "nocebo effect",
    "symptom recovery",
    "environmental intolerance"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.32,
      "reason": "Addresses IEI-EMF and interpretation consistent with non-EMF/nocebo mechanisms, relevant to broader EMF health-risk evaluation discussions."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/j.ecoenv.2025.118944
PubMed: 40897052

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