Byrne, E · Clinical and experimental neurology · 1991
This 1991 review examined ME/CFS from multiple scientific angles—including viral infection, immune system problems, metabolism, and mental health—to understand why this condition develops. The authors proposed that ME/CFS typically results from a combination of factors: personal characteristics before illness (like psychological traits or immune vulnerabilities), a trigger (such as a virus), and how someone's emotions respond to being sick. Rather than having one single cause, ME/CFS appears to exist on a spectrum of different presentations.
This work challenged the notion of a single cause for ME/CFS and introduced a biopsychosocial framework that validated the experiences of patients with diverse symptom presentations. For researchers, the proposed interaction model helped organize heterogeneous clinical observations and guided subsequent investigation into how viral, immunological, and psychological factors might converge in disease pathogenesis.
This review does not prove which specific viruses, immune mechanisms, or psychological factors are causally involved in ME/CFS, nor does it establish the relative importance of each proposed component. The model is conceptual rather than empirically validated, and the review predates modern biomarker research that might clarify disease heterogeneity.
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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