E2 ModerateModerate confidencePEM not requiredCross-SectionalPeer-reviewedReviewed
Comorbid personality disorders in chronic fatigue syndrome patients: a marker of psychopathological severity.
Calvo, Natalia, Sáez-Francàs, Naia, Valero, Sergi et al. · Actas espanolas de psiquiatria · 2015
Quick Summary
This study looked at whether people with ME/CFS are more likely to have personality disorders—long-standing patterns of thinking and behavior that can affect how someone relates to others. Researchers assessed 132 ME/CFS patients and found that about half had traits associated with personality disorders, particularly obsessive-compulsive and avoidant patterns. Patients with these personality traits also reported more depression, irritability, and guilt.
Why It Matters
Understanding the relationship between personality traits and psychiatric symptoms in ME/CFS may help clinicians identify patients who need additional psychological support and tailor interventions. This research highlights that ME/CFS is often accompanied by complex mental health presentations that warrant integrated care approaches rather than treating fatigue in isolation.
Observed Findings
- Approximately 48.5% of the 132 CFS patients met criteria for personality disorder traits on questionnaire assessment.
- Obsessive-compulsive and avoidant personality patterns were the most common types identified.
- Patients with personality disorder traits reported significantly more depressive symptoms than those without.
- Irritability, resentment, suspicion, and guilt showed the strongest associations with overall personality pathology severity.
- Personality disorder comorbidity was associated with a more complex and severe psychiatric symptom profile.
Inferred Conclusions
- Personality disorders are frequent comorbidities in CFS patients and may represent an important marker of psychiatric severity.
- The presence of personality disorder traits indicates patients likely require integrated psychological and medical management.
- Specific affective symptoms (guilt, irritability, suspicion) warrant clinical attention as they correlate with personality pathology in this population.
Remaining Questions
- Does personality disorder pathology precede ME/CFS onset, or do these traits develop secondarily to the experience of chronic illness and disability?
- What is the causal relationship, if any, between personality traits and the severity of fatigue and physical symptoms in ME/CFS?
What This Study Does Not Prove
This study does not prove that personality disorders cause ME/CFS or vice versa—it only shows they occur together more often than chance. The cross-sectional design cannot determine whether personality traits preceded illness onset or developed as a response to chronic illness. The study also cannot establish whether these personality patterns are primary psychological conditions or secondary adaptations to prolonged fatigue and disability.
Tags
Symptom:FatigueCognitive Dysfunction
Method Flag:Weak Case DefinitionNo ControlsExploratory OnlySmall Sample
Metadata
- PMID
- 25812543
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 12 April 2026
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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