Kang, Han K, Natelson, Benjamin H, Mahan, Clare M et al. · American journal of epidemiology · 2003 · DOI
This study compared Gulf War veterans to non-deployed veterans and found that those who served in the Gulf War had much higher rates of both PTSD and a condition resembling ME/CFS. Interestingly, while PTSD risk increased steadily with exposure to combat stress, ME/CFS-like illness only became more common at lower stress levels, suggesting that factors beyond stress alone may have caused the fatigue condition in Gulf War veterans.
This large epidemiological study provides evidence that ME/CFS-like illness occurred at substantially elevated rates in Gulf War veterans, and that deployment-related factors alone do not fully explain this excess risk. This suggests environmental or biological exposures unique to the Gulf environment may trigger ME/CFS, offering valuable clues for understanding ME/CFS etiology more broadly.
This study does not prove causation—it only establishes associations between Gulf War deployment and ME/CFS-like symptoms. The cross-sectional design cannot determine whether deployment-related factors actually caused illness or whether other unmeasured variables explain both deployment and illness risk. Additionally, the case definitions relied on self-reported symptoms rather than standardized diagnostic criteria, so the clinical characteristics of the 'CFS-like illness' observed may differ from ME/CFS diagnosed by other criteria.
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 →
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