E3 PreliminaryPreliminaryPEM not requiredCase-ControlPeer-reviewedReviewed
Standard · 3 min
Multiple chemical sensitivity caused by exposure to ignition coal fumes: a case report.
Yun, Myeong-Ja, Kang, Dong-Mug, Lee, Kyoung-Hye et al. · Annals of occupational and environmental medicine · 2013 · DOI
Quick Summary
This case report describes a 55-year-old woman who developed multiple chemical sensitivity (MCS)—a condition where exposure to everyday smells and chemicals triggers symptoms like swelling and muscle pain—after being exposed to coal fumes at work. Her symptoms started with coal fumes but gradually expanded to include reactions to city gas, burning smells, and exhaust. After careful testing ruled out other conditions, she was diagnosed with MCS and learned to avoid her triggers.
Why It Matters
This case is relevant to ME/CFS research because MCS and ME/CFS frequently co-occur and share overlapping symptom profiles including fatigue, myalgia, and hypersensitivity to environmental triggers. Understanding how occupational chemical exposures can precipitate MCS may illuminate mechanisms of sensitivity and symptom propagation in post-exposure conditions. The structured differential diagnosis approach may inform better recognition of MCS in patients misdiagnosed with fibromyalgia or chronic fatigue syndrome.
Observed Findings
Symptom onset (edema, myalgia) occurred following occupational exposure to ignition coal fumes
Progressive sensitization occurred: initial coal fume triggers expanded to include city gas, burning smells, and exhaust gas
Symptom avoidance and occupational removal (job resignation in November 2012) were associated with ongoing clinical management
Acute occupational chemical exposure can precipitate MCS with subsequent progressive expansion of chemical triggers
MCS should be considered in the differential diagnosis of patients presenting with multiple somatic symptoms following environmental exposures
Diagnosis requires systematic exclusion of other conditions such as FMS and CFS
Environmental control and trigger avoidance are important management strategies for MCS patients
Remaining Questions
What biological or genetic factors predispose some individuals to develop MCS after chemical exposure while others do not?
What This Study Does Not Prove
This single case report does not establish the prevalence or incidence of MCS from coal exposure, nor does it prove causation—temporal association between exposure and symptom onset does not exclude confounding environmental or biological factors. The study cannot determine whether the patient had underlying predisposition to MCS that was triggered by coal exposure versus whether coal exposure alone would cause MCS in the general population. Results are not generalizable beyond this individual case.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
Contribute
Private, reviewed by a human. Not a public comment thread.