E2 ModerateModerate confidencePEM ?Cross-SectionalPeer-reviewedMachine draft
The association of fatigue and pain with cognitive test performance in patients with myalgic encephalomyelitis/chronic fatigue syndrome.
Oosterman, Joukje M, van der Schaaf, Marieke, de Kleijn, Willemien P E et al. · Journal of psychosomatic research · 2025 · DOI
Quick Summary
This study looked at how fatigue and pain affect thinking and memory problems in people with ME/CFS. Researchers tested 1,375 patients on tasks like reaction time and attention, and found that both fatigue severity and pain severity were linked to worse cognitive performance. The effects were stronger in older patients, suggesting that age may play a role in how much fatigue and pain impact thinking abilities.
Why It Matters
Understanding which ME/CFS symptoms most affect cognition helps patients and clinicians prioritize symptom management strategies. This research suggests that treating pain and fatigue together, rather than separately, may be important for preserving cognitive function. The age-related findings could inform how cognitive difficulties are evaluated and managed differently across the lifespan of ME/CFS patients.
Observed Findings
- Fatigue severity was the only symptom independently associated with response inhibition (a measure of attention control).
- For other cognitive tasks (reaction time, processing speed, motor speed), fatigue severity consistently appeared alongside pain severity and/or measures of physical functioning and bodily pain.
- Age modified the relationships between symptoms and cognition, with stronger associations between pain/functioning and cognitive performance in older patients.
- Results were similar whether analyzing all CDC-defined patients or only those also meeting stricter NICE/IOM criteria.
- Symptom duration did not moderate the associations between symptoms and cognitive performance.
Inferred Conclusions
- Multiple interacting symptoms—including fatigue severity, pain severity, and overall impact on daily functioning—collectively relate to reduced cognitive performance in ME/CFS, rather than fatigue alone.
- Age is an important factor that influences how much pain and physical limitations affect thinking abilities, with older patients showing stronger symptom-cognition relationships.
- The multidimensional nature of ME/CFS symptom burden should be considered when evaluating and managing cognitive complaints in this population.
- Future research is needed to clarify whether these associations reflect causal mechanisms, and if so, in which direction.
What This Study Does Not Prove
This study cannot establish causation—it only shows that fatigue and pain are associated with lower cognitive performance, not that they directly cause it. The cross-sectional design means researchers cannot determine whether severe symptoms harm cognition, whether reduced cognitive function worsens symptoms, or whether a third factor affects both. This research does not prove that reducing fatigue and pain will improve cognition.
Tags
Symptom:Cognitive DysfunctionPainFatigue
Method Flag:Mixed CohortStrong Phenotyping