Gaab, Jens, Engert, Veronika, Heitz, Vera et al. · Journal of psychosomatic research · 2004 · DOI
This study tested whether ME/CFS patients have problems with their stress hormone system (the HPA axis). Researchers gave 18 ME/CFS patients and 17 healthy controls a special test that triggers the body's stress response and measured their hormones. They found that ME/CFS patients had a weaker hormone response, and this weakness was linked to how long someone had been sick and how severe their fatigue was.
This research provides objective neuroendocrine evidence of HPA axis dysfunction in ME/CFS and suggests that the severity of this dysfunction may reflect disease progression. Understanding whether hormonal dysregulation is a primary cause or a consequence of prolonged illness is critical for developing targeted treatments and may explain some of ME/CFS's core symptoms.
This study does not prove that HPA axis dysregulation causes ME/CFS or that correcting it will treat the disease. The cross-sectional design cannot establish causation or determine whether the hormonal changes preceded or resulted from prolonged illness. The small sample size (n=18) limits generalizability, and the findings do not explain whether other physiological systems are also involved in ME/CFS pathophysiology.
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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