E2 ModeratePreliminaryPEM unclearCross-SectionalPeer-reviewedMachine draft
Nasal secretion analysis in allergic rhinitis, cystic fibrosis, and nonallergic fibromyalgia/chronic fatigue syndrome subjects.
Baraniuk, J N, Clauw, D, Yuta, A et al. · American journal of rhinology · 1998 · DOI
Quick Summary
Many people with ME/CFS experience nasal congestion and rhinitis symptoms, but don't test positive for allergies. This study analyzed nasal fluid from ME/CFS patients and compared it to people with allergies, cystic fibrosis, and healthy controls to understand what might be causing these symptoms. The researchers found that ME/CFS patients' nasal fluid looked similar to healthy controls, suggesting that the constant baseline secretion processes in the nose are not abnormal in ME/CFS.
Why It Matters
Nasal/sinus symptoms affect most ME/CFS patients but are poorly understood, especially in those without allergies. This study provides objective biochemical evidence that FM/CFS-associated rhinitis operates through different mechanisms than allergic rhinitis, potentially guiding more targeted symptom management and future research into irritant-sensitivity or neurogenic inflammation.
Observed Findings
- Allergic rhinitis subjects had significantly elevated vascular permeability (IgG) and eosinophil cationic protein (ECP) levels compared to controls.
- Cystic fibrosis subjects had significantly higher elastase and total protein levels.
- Nonallergic FM/CFS subjects showed no significant differences in any measured markers compared to normal controls.
- Approximately 70% of FM/CFS subjects reported rhinitis symptoms despite only 35-50% having positive allergy skin tests.
Inferred Conclusions
- Constitutively active secretory processes in the nasal mucosa are not altered in nonallergic FM/CFS, distinguishing it from allergic rhinitis pathophysiology.
- Inducible, irritant-activated, or reflex-mediated mechanisms may better explain FM/CFS-associated rhinitis than baseline glandular/vascular dysfunction.
- Nonallergic rhinitis in FM/CFS likely operates through fundamentally different biological pathways than allergic or cystic fibrosis-related rhinitis.
Remaining Questions
- What inducible or irritant-activated mechanisms trigger nasal symptoms in FM/CFS patients?
- Does neurogenic inflammation or reflex-mediated secretion play a role in FM/CFS rhinitis?
- Why do 70% of FM/CFS patients report rhinitis symptoms if baseline nasal secretion markers are normal?
What This Study Does Not Prove
This study does not prove that rhinitis symptoms in ME/CFS are not mediated by nasal pathology—only that basal secretory markers are not elevated. It cannot explain what causes the rhinitis symptoms that patients actually experience, nor does it rule out inducible or reflex-mediated mechanisms. The small sample size and cross-sectional design limit generalizability and cannot establish causation.
Tags
Symptom:Pain
Biomarker:Blood Biomarker
Method Flag:Weak Case DefinitionSmall SampleExploratory Only
Metadata
- DOI
- 10.2500/105065898780707964
- PMID
- 9883301
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 10 April 2026
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 →
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