Aetiological Understanding of Fibromyalgia, Irritable Bowel Syndrome, Chronic Fatigue Syndrome and Classificatory Analogues: A Systematic Umbrella Review.
Kleinstäuber, Maria, Schröder, Andreas, Daehler, Sarah et al. · Clinical psychology in Europe · 2023 · DOI
Quick Summary
This study reviewed hundreds of scientific articles about ME/CFS, fibromyalgia, and irritable bowel syndrome to understand what researchers think causes these conditions. The researchers found that most studies focus on biological factors like immune system problems, while far fewer examine psychological or social causes. The review suggests that the best understanding comes from looking at multiple factors together—biological, psychological, and social—rather than just one type of cause.
Why It Matters
This comprehensive overview reveals significant gaps in how ME/CFS research is currently conducted and reported. By showing that biological factors dominate the literature while psychological and social dimensions are understudied, it highlights the need for more balanced, integrated research approaches that could lead to better understanding and treatment of ME/CFS.
Observed Findings
Biological factors were addressed in 90% of reviews (405 reviews), compared to psychological factors in 33% (150 reviews), social factors in 12% (54 reviews), and healthcare factors in 5% (23 reviews).
Only 29% of reviews (132 out of 452) examined two or more of the investigated conditions simultaneously.
Methodological quality was low or critically low in 41% of systematic reviews (104 reviews), moderate in 49% (126 reviews), and high in only 10% (25 reviews).
High-quality reviews identified deficient conditioned pain modulation, genetic factors, and immune/endocrine system changes as consistent risk factors across functional somatic syndromes.
Inferred Conclusions
Current research on functional somatic syndromes is heavily skewed toward biological explanations, with psychological and social factors severely underrepresented in the scientific literature.
Most published research lacks the methodological rigor and comprehensive biopsychosocial frameworks needed to fully understand the aetiologies of these conditions.
Future research must adopt higher scientific standards and integrated theoretical models that examine biological, psychological, and social factors simultaneously.
Remaining Questions
What explains the significant underrepresentation of psychological and social factors in the research literature—is it a knowledge gap, funding bias, or genuine differences in factor importance?
What This Study Does Not Prove
This umbrella review does not identify the actual cause of ME/CFS or prove that any specific factor causes the condition. It only surveys what has been published in scientific literature, which may reflect research funding patterns and biases rather than the true relative importance of different aetiological factors. The review cannot establish causation versus correlation for any identified risk factors.
How would aetiological understanding change if future research explicitly employed comprehensive biopsychosocial models from the outset rather than examining factors in isolation?
Which combination of biological, psychological, and social factors is most important for individual patients, and how do these interactions vary across ME/CFS presentations?
Why is there so little research examining healthcare system factors despite their potential role in symptom perpetuation or improvement?