Tomljenovic, Dejan, Baudoin, Tomislav, Megla, Zeljka Bukovec et al. · Medical hypotheses · 2018 · DOI
This study looked at how men and women with seasonal allergies respond differently to nasal irritants. Researchers found that women had stronger burning sensations and higher levels of a nerve-signaling chemical called substance P compared to men when exposed to salt water or allergen challenges. This suggests that women's bodies may process nasal irritation through a different biological pathway involving both immune cells and nerve signals.
ME/CFS shares several features with the conditions discussed in this study—including female predominance, neurogenic inflammation, and abnormal mast cell activation. Understanding gender-specific differences in neurogenic inflammatory pathways and substance P regulation may help explain why ME/CFS predominantly affects women and could inform development of gender-tailored therapeutic approaches targeting nerve-immune interactions.
This study does not establish causation between estrogen and the observed neurogenic differences; it is a mechanistic hypothesis study in a specific respiratory condition (allergic rhinitis) that may not directly translate to ME/CFS. The findings are correlational and the study does not directly test ME/CFS patients, so applicability to ME/CFS pathophysiology remains speculative. Small sample sizes and lack of detailed demographic/hormonal data limit generalizability.
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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