Kang, Han K, Li, Bo, Mahan, Clare M et al. · Journal of occupational and environmental medicine · 2009 · DOI
This study followed over 30,000 U.S. military veterans for 14 years after the 1991 Gulf War to track their health. Veterans who were deployed to the Gulf reported significantly more chronic fatigue, unexplained multi-symptom illness, PTSD, and other health problems compared to veterans who were not deployed. These health differences persisted over time, suggesting the Gulf deployment had lasting effects on veterans' wellbeing.
This study provides epidemiological evidence that a large cohort of Gulf War veterans developed chronic fatigue syndrome-like illness and multi-symptom unexplained illness at elevated rates compared to peers. Understanding the prevalence, persistence, and characteristics of post-deployment fatigue illness in a well-defined military cohort helps contextualize similar presentations in ME/CFS populations and may inform research into environmental, infectious, or stress-related triggers of chronic fatigue.
This study does not establish the cause of the elevated illness rates in Gulf War veterans, nor does it definitively prove deployment itself caused the illness (deployment was associated with multiple potential exposures). The reliance on self-reported symptoms rather than clinical diagnostic criteria means 'chronic fatigue syndrome-like illness' may not meet strict ME/CFS case definitions. The study cannot distinguish between illness resulting from combat exposures, environmental toxins, infections, or other deployment-related stressors.
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
Kang, Han K, Li, Bo, Mahan, Clare M, Eisen, Seth A, & Engel, Charles C (2009). Health of US veterans of 1991 Gulf War: a follow-up survey in 10 years.. Journal of occupational and environmental medicine. https://doi.org/10.1097/JOM.0b013e3181a2feeb
BibTeX
@article{mecfsatlas-kang-2009-health-veterans,
author = {Kang, Han K and Li, Bo and Mahan, Clare M and Eisen, Seth A and Engel, Charles C},
title = {Health of US veterans of 1991 Gulf War: a follow-up survey in 10 years.},
journal = {Journal of occupational and environmental medicine},
year = {2009},
doi = {10.1097/JOM.0b013e3181a2feeb},
note = {PubMed: 19322107},
url = {https://www.mecfsatlas.com/evidence/kang-2009-health-veterans},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/kang-2009-health-veterans
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