Scott, L V, Dinan, T G · Functional neurology · 1999
This study examined how the stress-response system in the brain works differently in people with ME/CFS. The researchers focused on the hypothalamic-pituitary-adrenal (HPA) axis, which is the body's main system for managing stress and producing cortisol. The study reviewed evidence suggesting this system may not function normally in ME/CFS patients, potentially contributing to their symptoms.
Understanding how the HPA axis functions abnormally in ME/CFS is crucial because this system regulates energy metabolism, immune function, and stress responses—all areas where ME/CFS patients experience dysfunction. This work helped establish neuroendocrine dysfunction as a biological mechanism worthy of investigation, moving beyond purely psychological explanations. Identifying HPA axis abnormalities may eventually lead to diagnostic biomarkers and targeted treatments.
This review does not prove that HPA axis dysfunction causes ME/CFS or is the sole mechanism driving the disease. The study cannot establish whether observed endocrine changes are primary defects or secondary consequences of chronic illness. Correlation between HPA axis abnormalities and symptoms does not demonstrate causation, and mechanistic reviews lack the prospective data needed to determine whether correcting these abnormalities would improve outcomes.
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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