Yang, Hyo-Seon, Lee, Jin-Seok, Kang, Mi-Hyun et al. · Environmental research · 2026 · DOI
This study found that exposure to humidifier disinfectants—cleaning chemicals used in humidifiers—may trigger ME/CFS by damaging the energy-producing structures (mitochondria) inside our cells and disrupting communication in the brain. Researchers compared patients with ME/CFS who had been exposed to these chemicals to laboratory mice exposed to the same chemicals, and both showed similar problems with mitochondrial function and brain health. The findings suggest that environmental toxins could be a trigger for ME/CFS in some people.
This research identifies a specific environmental chemical as a potential CFS trigger and demonstrates a biological mechanism—mitochondrial dysfunction and brain barrier disruption—that may explain how external exposures lead to ME/CFS symptoms. Understanding these mechanisms could help develop targeted treatments and inform public health policy regarding exposure prevention.
This study does not prove that PHMG-p exposure directly causes ME/CFS in all patients or that it is the primary cause in previously identified cases. The research is mechanistic and correlative; while it demonstrates associations in both patient samples and animal models, it does not establish causation in human populations or explain why only some exposed individuals develop CFS. The findings in mice may not fully translate to human disease.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Yang, Hyo-Seon, Lee, Jin-Seok, Kang, Mi-Hyun, Song, Mi-Kyung, Kang, Ji-Yun, Kim, Hyung Doo, et al. (2026). Chronic fatigue syndrome induced by environmental toxic exposure: Effects of polyhexamethyleneguanidine phosphate exposure on mitochondrial function and neural health.. Environmental research. https://doi.org/10.1016/j.envres.2026.123874
BibTeX
@article{mecfsatlas-yang-2026-chronic-fatigue,
author = {Yang, Hyo-Seon and Lee, Jin-Seok and Kang, Mi-Hyun and Song, Mi-Kyung and Kang, Ji-Yun and Kim, Hyung Doo and Kim, Hwan-Cheol and Leem, Jong-Han and Son, Chang-Gue and Lee, Kyuhong},
title = {Chronic fatigue syndrome induced by environmental toxic exposure: Effects of polyhexamethyleneguanidine phosphate exposure on mitochondrial function and neural health.},
journal = {Environmental research},
year = {2026},
doi = {10.1016/j.envres.2026.123874},
note = {PubMed: 41611066},
url = {https://www.mecfsatlas.com/evidence/yang-2026-chronic-fatigue},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/yang-2026-chronic-fatigue
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