Associations Between Psychological and Immunological Variables in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis: A Systematic Review. — CFSMEATLAS
Associations Between Psychological and Immunological Variables in Chronic Fatigue Syndrome/Myalgic Encephalomyelitis: A Systematic Review.
Raanes, Emilie F W, Stiles, Tore C · Frontiers in psychiatry · 2021 · DOI
Quick Summary
This review looked at 14 studies to understand how the mind and immune system are connected in ME/CFS. Researchers found that psychological factors like sleep quality, how people manage emotions, and how well they interact with others were linked to immune markers called cytokines. While these connections exist, the evidence is still limited and most studies were done at single points in time rather than following patients over years.
Why It Matters
Understanding how psychological and immune factors interact in ME/CFS could lead to better treatment approaches and help explain why this illness affects both mental and physical health. This review identifies an important gap in research—the lack of long-term studies tracking these relationships—which researchers can now address with improved study designs.
Observed Findings
Executive function showed associations with IL-1 and IL-6, and was the only psychological variable associated with CD4+ and CD8+ counts
Interpersonal function was associated with IL-6 and TNF-α levels
Poorer emotion regulation was associated with higher IL-2 levels
Sleep quality was associated with IL-1, IL-6, TNF-α, and IL-2
Lower psychological function (emotion regulation, interpersonal function, sleep) generally correlated with elevated cytokine levels
Inferred Conclusions
The brain-immune connection (psychoneuroimmunology) appears relevant to ME/CFS pathophysiology
Correlations exist between multiple psychological and immunological variables, but findings lack consistency across studies
Longitudinal research is critically needed to determine directional relationships and causality
Executive function may have unique associations with adaptive immune markers (CD4+/CD8+) compared to other psychological domains
Remaining Questions
Do psychological factors cause immune changes in ME/CFS, or do immune changes cause psychological symptoms, or is there bidirectional causality?
What This Study Does Not Prove
This review cannot establish whether psychological factors cause immune changes or vice versa, as most studies are correlational. The findings do not prove that treatments targeting psychological factors will change immune function or improve ME/CFS outcomes. Additionally, the small number of studies and heterogeneous methods mean these associations may not be consistent across all ME/CFS populations.