Faro, Mònica, Sàez-Francás, Naia, Castro-Marrero, Jesús et al. · Reumatologia clinica · 2016 · DOI
This study looked at differences between men and women diagnosed with ME/CFS, comparing 119 men with 1,190 women at the time of diagnosis. Men with ME/CFS tended to be younger, single, working in skilled jobs, and more commonly reported that an infection triggered their illness. Importantly, men reported less widespread pain, muscle symptoms, and other comorbid conditions than women, and reported better overall quality of life.
ME/CFS is dramatically underrecognized in men, comprising only ~9% of diagnosed cases despite affecting both sexes. Understanding that men may present with a distinct clinical phenotype—including fewer pain symptoms and comorbidities—could improve diagnosis and prevent male patients from being overlooked or misdiagnosed. This knowledge helps researchers understand the biological and social factors driving gender differences in disease expression.
This study does not prove that men actually have milder disease—it only shows differences at one point in time (diagnosis). The better quality of life scores in men could reflect reporting bias, different pain perception, or social/occupational factors rather than genuinely less severe illness. The cross-sectional design cannot establish whether these differences persist over time or explain the biological mechanisms underlying gender differences.
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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