Autoimmunity's enigmatic role: exploring the connection with myalgic encephalomyelitis/chronic fatigue syndrome.
Batham, Jacob, Dwyer, Jessica, Eaton-Fitch, Natalie et al. · BMC immunology · 2024 · DOI
Quick Summary
Researchers reviewed 10 studies to understand whether ME/CFS is caused by autoimmunity—a condition where the immune system attacks the body's own cells. While some signs of autoimmune activity were found in ME/CFS patients, the evidence is mixed and not strong enough to confirm that autoimmunity is the main cause. The authors conclude that ME/CFS is more complex than a straightforward autoimmune disease.
Why It Matters
This review clarifies that while immune abnormalities exist in ME/CFS, current evidence does not support autoimmunity as the primary disease mechanism, which has important implications for diagnostic approaches and treatment strategies. Understanding this distinction helps direct future research toward more accurate models of ME/CFS pathophysiology and prevents misdirected therapeutic interventions based on unproven autoimmune mechanisms.
Observed Findings
Ten studies investigating autoimmunity in ME/CFS were identified and synthesized.
Autoantibodies were detected in ME/CFS patients in multiple studies (n=6 studies examined this).
Genetic markers associated with autoimmunity were investigated in three studies.
Cytokine signalling abnormalities were documented in at least one study.
Findings across studies were inconsistent and did not converge on a unified autoimmune mechanism.
Inferred Conclusions
ME/CFS cannot currently be classified as a primary autoimmune disease based on available evidence.
Difficulty distinguishing true autoreactivity from immune dysregulation in ME/CFS complicates interpretation of autoimmune markers.
ME/CFS pathophysiology is more complex than a simple autoimmune model and likely involves multiple pathogenic mechanisms.
Urgent need for higher-quality, standardized research to clarify autoimmunity's role, if any, in ME/CFS.
Remaining Questions
Are autoimmune markers in ME/CFS patients primary pathogenic drivers or secondary consequences of other disease processes?
What This Study Does Not Prove
This study does not prove that autoimmunity plays no role in ME/CFS—only that current evidence is insufficient to confirm it as a primary cause. It does not establish that immune abnormalities found in ME/CFS patients are irrelevant to disease pathology; they may be secondary or contribute to symptom maintenance rather than disease initiation. The review cannot exclude the possibility that autoimmunity affects a subset of ME/CFS patients.
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 →