Disorders of Gut–Brain Interaction

Medically written by
A/Prof Viraj Kariyawasam
MBBS, FRACP, MRCP, PhD
Gastroenterologist & Hepatologist
Associate Professor – Macquarie University
Head of IBD Service – Blacktown Hospital
Last reviewed: March 2026

1. What are Disorders of Gut–Brain Interaction?

Disorders of gut–brain interaction are conditions in which gastrointestinal symptoms occur due to altered communication between the gut and the brain, rather than structural disease or inflammation. These conditions were previously referred to as ‘functional gastrointestinal disorders’.

Symptoms are real and can be significant, but routine tests such as blood tests, scans, and endoscopy are often normal.

2. Common Types of Gut–Brain Interaction Disorders

Common disorders include irritable bowel syndrome (IBS), functional dyspepsia, functional heartburn, functional chest pain, and chronic constipation or diarrhoea without an identifiable structural cause.

Many people experience overlap between conditions, for example IBS with functional dyspepsia or reflux-like symptoms.

3. Causes & Risk Factors

These disorders arise from a combination of altered gut sensitivity, changes in gut motility, and dysregulation of gut–brain signalling.

In disorders of gut–brain interaction, the nerves of the gastrointestinal tract become more sensitive to normal digestive processes. Signals travelling between the gut and the brain may be amplified, meaning that sensations such as stretching, gas, or movement are perceived as pain or discomfort.

The brain also plays a role in regulating gut movement, secretion, and immune activity. Stress, anxiety, and emotional responses can influence gut function, while ongoing gut symptoms can, in turn, heighten brain responses. This bidirectional relationship explains why symptoms often fluctuate and why psychological stress can worsen gut symptoms.

Contributing factors include stress, anxiety, prior gastrointestinal infection, changes in the gut microbiome, early life experiences, and genetic susceptibility.

4. Symptoms & How They May Present

Symptoms vary depending on the specific disorder and may fluctuate over time.

Common symptoms include abdominal pain or discomfort, bloating, altered bowel habits, nausea, early fullness, heartburn-like symptoms, and a heightened sensitivity to normal digestive processes.

5. How Are They Diagnosed?

Diagnosis is based on characteristic symptoms and exclusion of other conditions.

Investigations such as blood tests, stool tests, imaging, or endoscopy may be performed to exclude inflammatory, infectious, or structural disease. Once serious causes are ruled out, a positive diagnosis of a gut–brain interaction disorder can be made.

6. Treatment & Management Options

Gut-directed psychological therapies target the gut–brain axis directly. One well-studied approach is gut-directed hypnotherapy, which uses guided relaxation and imagery techniques to reduce gut sensitivity and normalise gut–brain communication.

Clinical studies have shown that gut-directed hypnotherapy can significantly improve symptoms in conditions such as irritable bowel syndrome and functional dyspepsia. Benefits often persist long after treatment ends. Importantly, hypnotherapy is not about control or suggestion, but about retraining how the brain and gut communicate.

Management is individualised and focuses on symptom control and quality of life.

Treatment may include dietary modification, medications to target gut sensitivity or motility, psychological therapies such as gut-directed cognitive behavioural therapy, and stress management strategies. Education and reassurance are key components of care.

7. Living With / Managing These Conditions

Disorders of gut–brain interaction are chronic but manageable conditions.

With the right combination of treatment, lifestyle adjustments, and support, most people experience significant improvement in symptoms and daily functioning.

8. When to Seek Medical Advice

Medical review is recommended for ongoing gastrointestinal symptoms affecting quality of life.

Urgent assessment is required if symptoms are associated with weight loss, gastrointestinal bleeding, iron deficiency anaemia, persistent vomiting, or symptoms that wake you from sleep.