This is general health information only and is not a substitute for advice from your GP or healthcare professional.
1. What are disorders of gut–brain interaction (DGBI)?
Disorders of gut–brain interaction are conditions involving abnormal communication and coordination between the gastrointestinal tract and the brain. They can cause symptoms such as abdominal pain, bloating, nausea, altered bowel habits, or discomfort even when routine investigations do not show a clear structural abnormality.
2. What conditions are classified as disorders of gut–brain interaction?
DGBI include several common gastrointestinal conditions, including irritable bowel syndrome (IBS), functional dyspepsia, chronic constipation, functional diarrhoea, nausea and vomiting disorders, and some disorders characterised by abdominal bloating or distension. The Rome Foundation provides diagnostic criteria for many of these conditions.
3. How does the gut–brain connection cause symptoms?
The gut and brain communicate continuously through the nervous system, hormones, immune pathways, and the gut microbiome. In DGBI, this communication can become altered, leading to increased sensitivity to normal intestinal activity, abnormal gut motility, changes in pain processing, or altered interactions between the gut and the nervous system.
4. Does having a DGBI mean the symptoms are psychological?
No. DGBI are genuine medical conditions and the symptoms are not simply “imagined” or caused by anxiety. Psychological factors such as stress, anxiety, and depression can influence the severity of symptoms through the gut–brain axis, but biological changes in gut sensitivity, motility, immune activity, and nervous-system processing also contribute.
5. What symptoms can occur with DGBI?
Symptoms vary considerably between individuals and may include abdominal pain, bloating, abdominal distension, constipation, diarrhoea, nausea, early fullness after eating, reflux-like symptoms, and changes in bowel habits. Symptoms can fluctuate over time and may be influenced by meals, stress, sleep, hormonal changes, and other factors.
6. How are disorders of gut–brain interaction diagnosed?
Diagnosis is usually based on the characteristic pattern of symptoms and the absence of features suggesting another significant gastrointestinal disease. The Rome IV criteria are commonly used internationally, although the clinical approach continues to evolve. Tests such as blood tests, stool tests, endoscopy, or imaging may be performed when clinically indicated to exclude other conditions.
7. Is the gut microbiome involved in DGBI?
The gut microbiome appears to influence the gut–brain axis and may contribute to symptoms in some people. However, the relationship is complex, and there is currently no single “abnormal microbiome” that can be used to diagnose DGBI. Commercial microbiome testing is therefore not routinely required for diagnosis or treatment.
8. How are disorders of gut–brain interaction treated?
Treatment is usually individualised and may include dietary strategies, regular physical activity, improving sleep, psychological therapies, gut-directed medications, and treatment directed at specific symptoms such as constipation, diarrhoea, abdominal pain, or nausea. Dietary approaches such as a structured low-FODMAP diet may help selected people with IBS when appropriately supervised.
9. Can stress make DGBI symptoms worse?
Yes. Stress can influence intestinal motility, visceral sensitivity, immune activity, and the way the brain processes signals from the gut. This can amplify symptoms without meaning that the underlying condition is purely psychological. Techniques such as gut-directed cognitive behavioural therapy, hypnotherapy, mindfulness, and other brain–gut behavioural therapies can be helpful for some patients.
10. When should I see a doctor about gastrointestinal symptoms?
You should seek medical assessment if symptoms are persistent, severe, or significantly affecting your quality of life, particularly if there is unexplained weight loss, gastrointestinal bleeding, persistent vomiting, iron-deficiency anaemia, fever, nocturnal symptoms, a significant change in bowel habits, or a relevant family history of gastrointestinal cancer or inflammatory bowel disease. These features may require investigation for conditions other than a DGBI.