Hamilton, W T, Gallagher, A M, Thomas, J M et al. · Psychological medicine · 2009 · DOI
This study looked at whether ME/CFS and irritable bowel syndrome (IBS) share common triggers or underlying causes. Researchers compared nearly 4,400 patients with fatigue syndromes to two control groups and found that infections—especially viral infections—appeared before ME/CFS developed, while stomach infections were more common before IBS. The findings suggest that while both conditions may have similar predisposing factors, the specific triggers that cause them to develop are different.
Understanding whether ME/CFS and IBS share common roots helps explain why many patients experience both conditions simultaneously. By distinguishing between predisposing factors (long-standing vulnerabilities) and triggering factors (events that precipitate illness), this study provides clues about the underlying mechanisms of ME/CFS and may eventually inform prevention and treatment strategies.
This study does not prove that infections cause ME/CFS or IBS—it shows only temporal association. The study cannot establish why some people develop these conditions after infection while others do not, nor does it identify the biological mechanisms connecting infections to disease development. Additionally, findings are limited to patients who sought primary care, potentially missing undiagnosed cases.
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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