Charles, Susan Turk, Gatz, Margaret, Kato, Kenji et al. · Health psychology : official journal of the Division of Health Psychology, American Psychological Association · 2008 · DOI
This study followed over 21,000 people for 25 years to see if personality traits measured in 1973 could predict physical health problems in 1998–2002. The researchers found that people who scored higher on neuroticism—a trait involving worry, emotional sensitivity, and stress—were more likely to report having chronic conditions, including chronic fatigue syndrome. However, when family history was considered, some of these connections weakened, suggesting that genetics may partly explain why certain personality traits and health problems run in families.
For ME/CFS patients and researchers, this study provides long-term evidence that personality traits like neuroticism may be associated with chronic illness risk, not merely a consequence of being ill. Understanding whether neuroticism reflects underlying biological vulnerability (genetic and physiological) versus purely psychological factors could inform both treatment approaches and our conceptualization of ME/CFS etiology.
This study does not prove that neuroticism causes physical illness; it shows only that higher neuroticism is statistically associated with later illness reporting. The study cannot determine whether neuroticism reflects pre-existing biological vulnerability, whether chronic stress from emotional instability damages health, or whether shared genetic factors influence both traits independently. Self-reported diagnoses without clinical confirmation mean conditions like CFS may be underdiagnosed or misreported.
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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