Gastric emptying is slow in chronic fatigue syndrome.
Burnet, Richard B, Chatterton, Barry E · BMC gastroenterology · 2004 · DOI
Quick Summary
This study found that people with ME/CFS often have stomach problems that can be measured with special imaging tests. Researchers compared 32 ME/CFS patients with 45 healthy people and discovered that most ME/CFS patients had slower movement of food through their stomachs, particularly liquids. These measured stomach delays matched up with how severe patients' digestive symptoms were.
Why It Matters
This study provides objective, measurable evidence that ME/CFS-related digestive symptoms are not purely psychological but reflect real physiological dysfunction in stomach movement. Understanding gastric dysmotility may help clinicians better manage nutritional challenges in ME/CFS and could guide future research into treating GI complications.
Observed Findings
72% of CFS patients (23/32) showed delayed liquid gastric emptying compared to historical controls
38% of CFS patients (12/32) showed delayed solid gastric emptying
Gastric emptying delays were significantly correlated with mean GI symptom scores (p<0.001)
Only 16% of CFS patients (5/32) showed delayed oesophageal clearance, with no significant difference from controls
Nocturnal diarrhoea was identified as a common but previously unreported symptom in CFS
Inferred Conclusions
Upper gastrointestinal motility dysfunction, particularly gastric dysmotility, is an objective physiological feature in a substantial proportion of CFS patients
The correlation between measured gastric delays and symptom severity suggests motility impairment contributes meaningfully to patient symptom burden
GI dysfunction in CFS extends beyond oesophageal involvement and primarily affects gastric function
Remaining Questions
Is gastric dysmotility a universal feature of ME/CFS or present only in a subset, and what determines which patients are affected?
Does gastric emptying dysfunction persist over time or change with disease severity and remission?
What This Study Does Not Prove
This study does not establish whether slow gastric emptying is a primary feature of ME/CFS or a secondary consequence of the disease. It cannot determine causality—whether the motility dysfunction causes symptoms or symptoms cause the dysfunction. The study also does not address whether gastric delay is present in all ME/CFS patients or only a subset.
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 →