Influence of Chronic Fatigue Syndrome Codiagnosis on the Relationship between Perceived and Objective Psychoneuro-Immunoendocrine Disorders in Women with Fibromyalgia. — CFSMEATLAS
Influence of Chronic Fatigue Syndrome Codiagnosis on the Relationship between Perceived and Objective Psychoneuro-Immunoendocrine Disorders in Women with Fibromyalgia.
Otero, Eduardo, Gálvez, Isabel, Ortega, Eduardo et al. · Biomedicines · 2023 · DOI
Quick Summary
This study compared women with fibromyalgia (FM), some of whom also had been diagnosed with chronic fatigue syndrome (CFS), to healthy women. Researchers measured both what patients reported feeling (like stress and pain levels) and actual biological markers in their blood (like stress hormones and immune chemicals). They found that FM patients generally felt worse than healthy women, and their blood work matched this—showing higher stress hormones and lower mood-boosting chemicals. Interestingly, FM patients who also had a CFS diagnosis showed different blood markers than those with FM alone, suggesting these two conditions may overlap in ways that current diagnosis methods don't catch.
Why It Matters
This research highlights a critical diagnostic challenge: ME/CFS and fibromyalgia may be misdiagnosed or confused because subjective symptoms overlap significantly. By demonstrating that objective biomarkers reveal biological differences between these conditions, the study supports the case for blood tests and other objective measures to distinguish them—potentially improving diagnosis and treatment for both patient groups.
Observed Findings
FM patients reported worse psychological state and lower quality of life compared to healthy women.
FM patients showed objective markers of stress dysregulation: elevated cortisol and noradrenaline, and reduced serotonin.
FM patients with previous CFS diagnosis had lower systemic IL-8, cortisol, and oxytocin, but higher adrenaline and serotonin compared to FM patients without CFS diagnosis.
Accelerometry revealed FM patients had more sedentary behavior patterns related to fatigue severity.
Perceived stress, anxiety, and pain levels in FM patients aligned with objective biomarker abnormalities.
Inferred Conclusions
FM and CFS may represent overlapping or distinct neuroendocrine-immune dysregulation patterns that require objective biomarker assessment for accurate differential diagnosis.
Objective neuroimmunoendocrine biomarkers reveal important biological differences not detected by subjective symptom assessment alone.
CFS may be overdiagnosed in FM populations due to symptom overlap, and objective testing could improve diagnostic discrimination.
Remaining Questions
What is the optimal combination of biomarkers needed to reliably distinguish FM from CFS in clinical practice?
What This Study Does Not Prove
This study does not prove that CFS is overdiagnosed in FM populations generally, only that biomarker patterns suggest potential overdiagnosis in this particular sample. It is a cross-sectional snapshot and cannot establish causation or whether these biomarker differences actually explain clinical outcomes. The study also does not determine which biomarkers would be most useful in clinical practice for differential diagnosis.