Irritable Bowel Syndrome (IBS)

This guide covers what DVA looks for when assessing this condition, including the relevant Statement of Principles factors, the evidence you should gather, and common preparation tips. Expand each section for more detail.

You are reviewing the condition-specific guidance to understand what evidence and preparation DVA expects.

DiseaseVETS Act 2026

Also known as: IBSIrritable Bowel Syndrome is a common digestive condition causing abdominal pain, bloating, and changes in bowel habits (diarrhoea, constipation, or both). In veterans it is often linked to stress, anxiety, PTSD, or gastrointestinal infections acquired during deployment.

DVA uses Statements of Principles () from the Repatriation Medical Authority to determine whether a condition can be linked to service. For IBS, DVA generally considers the following factors:

Having a gastrointestinal infection (bacterial, viral, or parasitic) during service that preceded the onset of IBS
Having a psychiatric condition linked to service (PTSD, depression, anxiety) that contributes to IBS
Experiencing a severe psychosocial stressor within one year before onset
Having coeliac disease or inflammatory bowel disease linked to service

Reference: SoP No. 75 of 2019 (Reasonable Hypothesis) / SoP No. 76 of 2019 (Balance of Probabilities). RH applies to operational/warlike service; BoP applies to peacetime service. Verify at rma.gov.au.Source: rma.gov.au — verify this directly with DVA for your circumstances.

DVA uses two different standards of proof depending on your type of service. Understanding which applies to you can help you prepare your evidence.

Reasonable Hypothesis (RH)Applies to: operational, warlike, or non-warlike serviceUnder the Reasonable Hypothesis standard (operational/warlike/non-warlike service), DVA generally considers that having a service-related psychiatric condition (PTSD, anxiety, depression) that contributes to IBS, or experiencing a relevant gastrointestinal infection during service — with clinical onset within a relevant period — is sufficient to raise a reasonable hypothesis.

Balance of Probabilities (BoP)Applies to: peacetime serviceUnder the Balance of Probabilities standard (peacetime service), DVA generally considers that the veteran must show it is more likely than not that IBS was caused or materially contributed to by service-related factors.

In plain EnglishIf you had operational or warlike service, the Reasonable Hypothesis (RH) standard applies — this is a lower threshold. If your service was peacetime only, the stricter Balance of Probabilities (BoP) standard applies. IBS is frequently claimed as secondary to PTSD or anxiety. SoP instruments are updated periodically by the RMA. Always verify the current instrument at rma.gov.au/sops.

Benefit of the doubt: DVA is legally required to give you the benefit of the doubt if evidence is evenly balanced (s119 , s335 ). Learn more

DVA generally considers the standard of proof based on your service type. Verify this directly with DVA or a qualified advocate.

Required

Clinical diagnosis of IBSA diagnosis from your GP or gastroenterologist. IBS is typically diagnosed based on symptoms and exclusion of other conditions.How to get it: See your GP. They may refer you to a gastroenterologist to rule out other conditions.Estimated time: 2-6 weeks

Evidence of the service-related causeDeployment records showing where you served (for infection link) or DVA acceptance letter for primary mental health condition.How to get it: Request deployment records from Defence or use your DVA acceptance letter for the mental health condition.Estimated time: 4-8 weeks for Defence records

Medical nexus reportA report linking your IBS to service — either through infection, mental health condition, or stress.How to get it: Ask your GP or gastroenterologist.Estimated time: 2-4 weeks

If you had gastro during deployment (food poisoning, travellers diarrhoea), document this — post-infectious IBS is well-recognised
IBS is commonly linked to PTSD and anxiety through the gut-brain connection — your specialist can explain this in their report
Keep a food and symptom diary if you can — this helps your doctor diagnose and manage the condition

Medical nexus statement (from your doctor)

A medical opinion linking your IBS to service — either through infection or mental health.

What to ask your doctor

I developed IBS after severe gastro during my deployment to [location]. Could you write a report for my DVA claim?
I am claiming IBS secondary to my accepted PTSD. Could you explain the gut-brain connection in a report?

Personal statement (your own words)

Describe the onset, the service connection, and the current impact on your life.

Suggested structure

When digestive problems started
Any gastrointestinal illness during deployment
How IBS affects your daily life — diet restrictions, social impact, work limitations
Connection to your mental health condition if applicable

Common mistakes to avoid

✗Not connecting IBS to the specific SoP factor pathway

Treatments DVA may cover

Gastroenterologist consultations
Medications for IBS symptoms
Dietitian consultations
Psychological treatment (gut-directed hypnotherapy, CBT)

Next steps to consider

Proceed to Permanent Impairment claim if applicable
Manage through diet, medication, and stress reduction
Ensure primary condition (if mental health) is also being treated

Actual entitlements depend on individual DVA assessment. This is indicative only.

Ready to take the next step?

You do not need to have everything ready before you start. Use these tools to work through the process at your own pace.

Check My Eligibility Build Evidence Checklist View Forms How to Lodge

Official + GuidanceVerified March 2026

This page combines official DVA information with platform-authored guidance. Official sources are cited where applicable.

SoP factors sourced from RMA. Guidance text explains official processes in plain language.

RMA — Statements of Principles

This is a guide onlyThis information is a free guide. It is not legal advice, medical advice, or financial advice. Always verify with DVA directly or with a qualified advocate before lodging a claim.

When you are readyBuild your evidence checklist

Irritable Bowel Syndrome (IBS)

Required

Recommended

Ready to take the next step?