Klimas, N · Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society · 1998 · DOI
This 1998 review article explores how ME/CFS and fibromyalgia may develop, focusing on potential biological mechanisms in the body. The researchers, led by Dr. Nancy Klimas, examined connections between growth hormone, immune system dysfunction, and the symptoms patients experience. Understanding these underlying causes is an important step toward better treatments.
This work helped establish a biological framework for understanding ME/CFS and fibromyalgia beyond purely psychological explanations, supporting the recognition of these as medical conditions with measurable physiological abnormalities. For patients, the focus on growth hormone and immune dysfunction validated that real biological mechanisms—not just psychological factors—underlie their symptoms.
As a review article without original experimental data, this study does not prove causation of any specific mechanism or provide new empirical evidence. The proposed connections between growth hormone and ME/CFS remain theoretical frameworks requiring direct experimental validation. This work cannot establish which biological abnormalities are primary causes versus secondary consequences of illness.
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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