Functional Gastrointestinal Disorders in Brisbane
Assessment and management of functional gastrointestinal disorders (FGIDs) — including IBS and functional dyspepsia — by GI-focused surgeon Dr Goutham Sivasuthan, across Brisbane, Redland, Moreton Bay and Logan.
Expert insight into functional GI disorders
Functional gastrointestinal disorders (FGIDs) are chronic conditions in which the digestive system does not work as it should, despite normal scans and blood tests. They are very common, very real, and — with the right approach — very manageable.
If you are struggling with persistent digestive symptoms in Brisbane, a GI-focused surgeon such as Dr Goutham Sivasuthan can help confirm the diagnosis, exclude serious causes, and build a management plan — while identifying the minority of patients whose symptoms point to a structural problem that benefits from a procedure.
What are functional GI disorders?
FGIDs (now often called disorders of gut–brain interaction) are diagnosed by their pattern of symptoms rather than by visible damage, because investigations come back normal even though the gut is not functioning comfortably. They are strongly linked to the gut–brain axis — the two-way communication between the digestive system and the nervous system — which is why stress, anxiety and sleep can all influence symptoms. Related motility and functional conditions such as biliary dyskinesia, sphincter of Oddi dysfunction and gastroparesis can present similarly and may need specialist assessment.
Common types of FGIDs
Irritable bowel syndrome (IBS)
Abdominal pain or cramping (often relieved by a bowel motion), bloating and gas, with diarrhoea, constipation or both (IBS-D, IBS-C, IBS-M).
Functional dyspepsia
Persistent upper-abdominal discomfort, early fullness, a burning sensation, nausea and bloating without an ulcer.
Functional constipation & diarrhoea
Slow or overactive bowel function without infection or inflammation.
Biliary dyskinesia
A gallbladder that does not empty properly, causing gallstone-like pain. Learn more →
Sphincter of Oddi dysfunction
Abnormal contraction of the valve controlling bile and pancreatic flow, causing severe upper-abdominal pain.
Gastroparesis
The stomach empties too slowly, causing nausea, vomiting and bloating. Learn more →
What causes FGIDs?
- Gut–brain axis dysfunction — stress and anxiety disrupt nerve and hormone signalling between brain and gut.
- Altered gut motility — muscles contract too fast (diarrhoea) or too slow (constipation).
- Visceral hypersensitivity — the gut becomes more sensitive to normal sensations.
- Gut microbiome imbalance — contributes to bloating and irregular bowel habit.
- Food intolerances — gluten, lactose or FODMAPs can trigger symptoms in some people.
- Post-infection — IBS can begin after a bout of gastroenteritis.
Diagnosis — ruling things out
Because FGIDs do not show on standard imaging, diagnosis involves recognising the symptom pattern (using the Rome criteria) while excluding other conditions such as coeliac disease, inflammatory bowel disease, ulcers or bowel cancer. Investigations may include blood tests, stool tests, breath tests, gastroscopy and colonoscopy. Where a structural or motility problem such as biliary dyskinesia or gastroparesis is suspected, targeted tests follow.
Treatment options
Dietary modification
A low-FODMAP approach, fibre adjustments and sometimes probiotics, ideally guided by a dietitian, to settle bloating and bowel habit.
Medications
Antispasmodics for cramping, laxatives or anti-diarrhoeals as needed, and low-dose neuromodulators for pain and gut–brain signalling.
Mind–body therapies
Cognitive behavioural therapy, gut-directed hypnotherapy, mindfulness and regular exercise, which have strong evidence for IBS.
Procedural / surgical input
Reserved for specific conditions — for example gallbladder removal for biliary dyskinesia, or treatment for severe gastroparesis.
Diet and the gut–brain connection
Because the gut and brain are in constant communication, looking after both helps symptoms. Eating regular, unhurried meals, identifying and limiting personal trigger foods (often guided by a structured low-FODMAP trial), staying physically active, prioritising sleep, and managing stress can all meaningfully reduce flare-ups. For many people a combination of dietary and psychological strategies works better than either alone.
When to seek help from a surgeon
See a specialist promptly if you have any warning signs that are not typical of a functional disorder: unexplained weight loss, blood in the stool, difficulty swallowing, persistent vomiting, anaemia, a family history of bowel cancer, symptoms starting after age 50, or pain that wakes you from sleep. These warrant investigation to exclude a structural cause.
Clarity and a tailored plan
- ✓GI-focused expertise — accurate diagnosis and management.
- ✓Thorough work-up — ruling out serious causes first.
- ✓Multidisciplinary care — coordinated with GPs, gastroenterology and dietetics.
- ✓Surgery only when needed — most FGIDs are managed without an operation.
- ✓Care close to home — Brisbane, Redland, Moreton Bay and Logan.
Functional GI disorder FAQs
Are functional GI disorders serious?+
They are not dangerous in the way cancer is, but they are real and can significantly affect quality of life. The first priority is to confirm the diagnosis and exclude serious causes, then manage symptoms effectively.
Do functional GI disorders need surgery?+
Most do not. Surgery is reserved for specific conditions such as biliary dyskinesia or severe gastroparesis; the majority are managed with diet, medication and mind–body strategies.
How are FGIDs diagnosed if my tests are normal?+
Diagnosis is based on the symptom pattern using the Rome criteria, after excluding other conditions with blood, stool, breath and sometimes endoscopic tests. Normal tests are expected and help confirm the diagnosis.
What dietary change helps most?+
A structured low-FODMAP approach helps many people with IBS-type symptoms. It is best done with a dietitian, who guides the elimination and careful reintroduction of foods.
Can stress really affect my gut?+
Yes. The gut and brain communicate constantly, so stress, anxiety and poor sleep can worsen symptoms. Addressing them is a recognised part of treatment.
Is IBS curable?+
IBS is usually a long-term condition, but symptoms can often be well controlled — and sometimes settle for long periods — with the right combination of diet, lifestyle and, if needed, medication.
When should I worry about my symptoms?+
Warning signs such as weight loss, bleeding, difficulty swallowing, persistent vomiting or anaemia are not typical of functional disorders and should be assessed promptly.
Will I be referred to other specialists?+
Often FGIDs are managed by a team — your GP, Dr Goutham, a gastroenterologist and a dietitian — depending on your symptoms and needs.
Caring for South-East Queensland
Dr Goutham consults and operates across Brisbane, Redland, Moreton Bay and Logan — care close to home, wherever you are in South-East Queensland.
Trusted resources
Last medically reviewed by Dr Goutham Sivasuthan, specialist surgeon — June 2026.
Get answers for persistent digestive symptoms
Book an assessment with Dr Goutham for a clear diagnosis and a tailored management plan.