McEvedy, C P, Beard, A W · British medical journal · 1970 · DOI
Quick Summary
This 1970 study reviewed 15 reported outbreaks of myalgic encephalomyelitis (ME) and concluded that many of these cases may have been caused by mass hysteria or misdiagnosis rather than a physical disease. The authors suggested that future similar cases should be called 'myalgia nervosa' to reflect a psychological rather than biological cause. This interpretation is now considered outdated, as modern research has identified real biological abnormalities in ME/CFS.
Why It Matters
This paper represents an important historical turning point in ME/CFS understanding. Its dismissal of ME as primarily psychogenic influenced medical attitudes for decades, delaying serious investigation into biological mechanisms and potentially contributing to stigma around the illness. Understanding this research context helps patients and advocates recognize why ME/CFS faced decades of skepticism despite accumulating biomedical evidence.
Observed Findings
15 historical outbreaks of benign myalgic encephalomyelitis were identified and reviewed
Direct clinical data examination was conducted on one outbreak
The authors observed that multiple patients presented with similar symptoms across these outbreaks
Community-level factors appeared to correlate with outbreak timing and spread
Inferred Conclusions
Many historical ME epidemics were likely caused by mass hysteria rather than infectious or organic disease
Altered medical and community perception contributed to some outbreak phenomena
Functional or psychological mechanisms should be considered primary in future similar cases
The condition should be relabeled 'myalgia nervosa' to reflect presumed psychological etiology
Remaining Questions
What objective biological markers, if any, were assessed in the original outbreak cases?
How were cases distinguished between true psychogenic illness and undiagnosed organic disease given the diagnostic tools available in the mid-20th century?
Why did similar outbreaks continue to be reported after this paper if the psychogenic explanation was valid?
What This Study Does Not Prove
This study does not prove that ME/CFS is psychological in origin. Modern research using objective biomarkers (immune dysfunction, metabolic abnormalities, post-exertional malaise) has contradicted the hysteria hypothesis. The study's retrospective interpretation of historical outbreaks cannot establish causation, and observer bias in categorizing cases as 'psychogenic' versus organic was not controlled for.
Tags
Symptom:PainFatigue
Phenotype:Pediatric
Method Flag:PEM Not DefinedWeak Case DefinitionNo Controls