The Psychosomatic Era (circa 1969-1983)
1 The McEvedy Hypothesis
In 1970, McEvedy and Beard published a reinterpretation of the Royal Free outbreak in the British Medical Journal proposing that the epidemic was “mass hysteria” (McEvedy and Beard 1970). Their argument rested on three observations: female predominance (which they interpreted as psychogenic vulnerability rather than biological susceptibility), absence of mortality, and negative laboratory findings. The paper did not present new clinical data — it was a desk reinterpretation of the existing outbreak reports.
McEvedy’s hypothesis was methodologically vulnerable on multiple grounds: it assumed negative standard laboratory tests implied non-organic etiology (a logical error — absence of evidence for a known pathogen is not evidence of absence of disease); it interpreted female predominance as psychogenic rather than immunological (women have higher rates of most autoimmune diseases); and it failed to account for the neurological examination findings and prolonged disability documented in the primary reports.
Nevertheless, the paper was influential. Published in a leading journal during a period when psychoanalytic frameworks were ascendant in medicine, it established a psychosomatic framing that dominated clinical teaching and research for the next 40 years. The term “myalgic encephalomyelitis” was replaced in many contexts by “chronic fatigue syndrome” — a name that McEvedy’s conceptualization had made possible by semantically reframing the disorder from a neurological to a psychiatric entity.
2 Ramsay’s Rebuttal
Ramsay, who had personally examined Royal Free patients during the 1955 outbreak, published a book-length rebuttal in 1986 documenting long-term follow-up showing organic sequelae inconsistent with hysteria (Ramsay 1986). Patients had objective findings — abnormal muscle biopsy, persistent neurological signs, exercise intolerance — that could not be explained psychosomatically. Ramsay’s career-defining position was that the Royal Free outbreak was an organic neurological disease, and that the McEvedy reinterpretation was a failure of clinical epistemology — mistaking negative standard tests for the absence of pathology.
The Ramsay-McEvedy debate crystallized a deeper epistemological tension: when standard tests are normal, does the abnormality lie in the patient’s psychology or in the sensitivity of the tests? The next 40 years of ME/CFS history would be shaped by which answer a given clinician or institution favored.
3 WHO Classification, 1969
In 1969, the World Health Organization classified benign myalgic encephalomyelitis under disorders of the nervous system in ICD-8, placing it alongside postviral fatigue syndrome under code G93.3 in ICD-10 (1992) and subsequently 8E49 in ICD-11 (2022). The WHO classification consistently placed ME/CFS in the neurological chapter — a position that contradicted psychosomatic framing and provided a formal institutional anchor for biological disease recognition.