Statement of Principles concerning irritable bowel syndrome (Reasonable Hypothesis) (No. 65 of 2019)

The central legal concept is the "reasonable hypothesis". Under VEA section 120 and MRCA section 335, a claim for IBS must succeed if the material before the Commission raises a reasonable hypothesis connecting the condition to service, unless there is a contrary proof beyond reasonable doubt. This SoP operationalises that standard: if at least one of the section 9 factors exists and is related to relevant service, a reasonable hypothesis is deemed raised. The SoP does not define "reasonable hypothesis" itself but uses the factors as a proxy.

"Clinically significant disorder of mental health as specified" is a defined term listing nine conditions: agoraphobia, alcohol use disorder, anxiety disorder, bipolar disorder, depressive disorder, eating disorder, obsessive compulsive disorder, panic disorder, and posttraumatic stress disorder. The condition must be "of sufficient severity to warrant ongoing management". The note clarifies that management may involve regular visits (at least monthly) to a psychiatrist, counsellor or general practitioner, but does not require that any actual management was received. This creates a subjective element: the severity threshold is based on what would warrant management, not what was actually done.

Three categories of stressor are defined. Category 1A covers life-threatening events, serious physical attack (including rape and sexual molestation), and being threatened with a weapon, held captive, kidnapped or tortured. Category 1B covers killing or maiming a person, being an eyewitness to a person being killed or critically injured, being an eyewitness to atrocities, participating in clearance of a corpse or critically injured casualty, or viewing a corpse or critically injured casualty as an eyewitness. Category 2 covers chronic negative life events that cause ongoing distress: social isolation, long-term relationship problems, work or school environment concerns, serious legal issues, severe financial hardship, a family member or significant other's major health deterioration, or being a full-time caregiver. Category 2 has a time limit of within one year before clinical onset or worsening, whereas categories 1A and 1B have a six-month window.

"Hostile or life-threatening environment" is defined as a situation characterised by a pervasive threat to life or bodily integrity, with three examples: experiencing or being under threat of artillery, missile, rocket, mine or bomb attack; experiencing or being under threat of nuclear, biological or chemical agent attack; or being involved in combat or going on combat patrols. A cumulative period of at least four weeks is required within six months before onset or worsening.

"Episode of severe diarrhoea" means an acute illness with frequent, loose, watery motions caused by an infective organism, of sufficient severity to warrant medical attention, or in the absence of intervention lasting at least four days. "Severe childhood abuse" covers serious physical, emotional, psychological or sexual harm, or neglect, while a child under 16, perpetrated by a parent, care provider, adult who works with or around that child, or any other adult in contact. "Inability to obtain appropriate clinical management" is left undefined in the dictionary but appears as factor 15. It presumably means that the person could not access medical treatment that would have controlled or mitigated the IBS, and that this inability was related to service.

"Terminal event" is defined for death claims and includes pneumonia, respiratory failure, cardiac arrest, circulatory failure, or cessation of brain function. The SoP covers death contributed to by IBS.

The SoP directly affects veterans, members of Peacekeeping Forces, and members of the Forces under the VEA, as well as members under the MRCA. "Relevant service" is defined exhaustively: operational service, peacekeeping service, hazardous service, and British nuclear test defence service under the VEA; and warlike and non-warlike service under the MRCA. This means that members who served only in peacetime domestic service not falling within those categories (for example, normal peacetime army service not classified as hazardous) cannot rely on this SoP. The instrument affects those who have already been diagnosed with IBS or who die from IBS, and who are able to point to a factor that occurred in the context of their relevant service.

Decision-makers within the Department of Veterans' Affairs and the Repatriation Commission are directly bound. When assessing a claim, they must check whether the claimant satisfies the diagnostic criteria for IBS as defined in subsection 7(2) (not merely a clinical diagnosis using different criteria). They must then examine each factor in section 9 with the precise temporal windows. For example, factor 4 requires living or working in a hostile or life-threatening environment for a cumulative period of at least four weeks within six months before clinical onset. If the period was three weeks and one day, it will not meet the threshold even if the environment was extremely dangerous.

Clinicians providing medical reports for clients will be affected because their reports must address the SoP factors. A general practitioner's letter stating the veteran has "stress-related IBS" may be insufficient unless it identifies a specific stressor category, a diagnosed mental health condition, or evidence of severe diarrhoea caused by an infective organism. The SoP encourages a checklist approach to medical evidence. Lawyers and advocates representing veterans must be familiar with the dictionary definitions to avoid arguments failing at the reasonable hypothesis stage. For example, they must know that "corpse" excludes closed body bags, so witnessing a closed body bag at a military accident does not constitute category 1B exposure.

The instrument also affects the Commonwealth's fiscal position. Each accepted claim creates a liability for compensation payments (disability pension, medical treatment, and in death cases, dependant's benefits). The SoP expands or contracts the pool of eligible claimants relative to the 2011 SoP it repealed. Since the 2011 SoP is not publicly available to us, we cannot compare, but the fact of repeal indicates that the RMA updated the factors based on new sound medical-scientific evidence. The SoP does not affect the general public or non-veteran IBS sufferers; it is a bespoke veterans' compensation tool.

The SoP itself imposes no duties directly on individuals. It is a legislative instrument that confers a right: the right to have a claim assessed using these factors as the threshold for a reasonable hypothesis. The duty lies on the Repatriation Commission and the Military Rehabilitation and Compensation Commission to apply the SoP correctly when making decisions. The right is not absolute; a claimant is not automatically entitled to compensation merely because they have IBS and served. They must demonstrate that at least one of the 15 factors existed and was related to relevant service, and that the factor existed within the specified temporal window.

Claimants have the right to rely on any factor, including factors 9-15 if claiming worsening. Section 10(2) restricts worsening factors to cases where the IBS was suffered or contracted before or during (but did not arise out of) the person's relevant service. This means that if the IBS first manifested during a period of relevant service, the worsening factors cannot be used to claim aggravation of that service-related condition; instead, the onset factors must be used. That distinction is a trap.

The right to "inability to obtain appropriate clinical management" (factor 15) is potentially broad but also ambiguous. It does not require that the inability was intentional or negligent; it simply requires that the person was unable to obtain appropriate management. The inability must be related to relevant service. For example, a veteran posted to a remote location with no gastroenterology services may meet this factor. But proving inability may require evidence of specific efforts to obtain care or systemic barriers.

The SoP also creates a right for claimants to rely on other SoPs through section 11. If a factor in this SoP refers to an injury or disease covered by another SoP (for example, posttraumatic stress disorder), the factors in that other SoP apply. This cross-referencing chain means that a claimant can indirectly rely on a factor from another SoP if it is needed to establish the existence of a diagnosed mental health condition that in turn triggers factor 2 or factor 9. The practical effect is that the SoP is part of a web of interlocking legislative instruments.

This SoP contains no penalty provisions. It is a determination of medical-scientific factors, not a regulatory code with fines or imprisonment. Enforcement of the SoP occurs through the administrative review system. If the Repatriation Commission refuses a claim on the basis that no factor is established, the claimant may seek review by the Veterans' Review Board, then the Administrative Appeals Tribunal, and ultimately the Federal Court on questions of law. The SoP may be challenged as ultra vires the RMA's powers under section 196B VEA, or as not being based on sound medical-scientific evidence. Such challenges are rare but possible.

Penalties for false statements or fraud in relation to a claim are found in the VEA (section 214 provides for fines and imprisonment for obtaining payments by false representations) and the Criminal Code. But those are not within this SoP.

The SoP indirectly affects enforcement of compensation liabilities because a successful claim obliges the Commonwealth to pay ongoing pension amounts. The SoP determines the gateway. If a veteran later dies from a terminal event contributed to by IBS (subsection 7(5)), dependants may make a claim. The SoP would be used to determine whether the IBS itself was service-related, as a precondition to dependency benefits.

This SoP is made under subsection 196B(2) VEA and section 338 MRCA specifically for the "reasonable hypothesis" standard of proof. There is a parallel SoP made under subsection 196B(3) VEA for the "balance of probabilities" standard, which applies to claims where the reasonable hypothesis standard is not applicable (e.g., some MRCA claims for non-warlike service). This instrument is only for the reasonable hypothesis standard. Practitioners must ensure they use the correct SoP version.

The SoP interacts with VEA Part II (pensions) and Part IIA (statements of principles). It also interacts with MRCA Chapter 6 (liability for injuries, diseases, and death). The definitions of "relevant service" in the dictionary tie directly to definitions in the VEA and MRCA. For example, "operational service" under the VEA is defined in section 6C of that Act; the SoP does not replicate that definition but references it through the term. Similarly, "warlike service" and "non-warlike service" are defined under the MRCA.

Section 11 of the SoP creates a cross-reference to other SoPs. If a factor (e.g., "clinically significant disorder of mental health as specified") includes a condition like PTSD, then the SoP for PTSD (if one exists) may need to be applied to determine whether the person's PTSD is itself related to service. This chains Statements of Principles together, meaning that a veteran may need to satisfy the PTSD SoP before they can use the IBS SoP's factor for clinically significant mental health disorder. This can create cascading evidentiary requirements.

The SoP repeals the previous IBS SoP (No. 27 of 2011) and replaces it. Claims made before 22 July 2019 that were not yet determined may be subject to the new SoP if the Commission applies the instrument in force at the time of decision. The commencement date (22 July 2019) is crucial.

The SoP does not interact directly with state workers' compensation or tort law, but a veteran who also has a civil claim against the Commonwealth (e.g., for negligent medical treatment causing IBS) would not rely on this SoP; it is specific to the statutory compensation scheme.

This SoP, No. 65 of 2019, was determined on 21 June 2019 and commenced on 22 July 2019. It repealed the Statement of Principles concerning irritable bowel syndrome No. 27 of 2011 (Federal Register of Legislation No. F2011L00783), which had been made under subsection 196B(2) VEA. The 2011 SoP was itself a replacement of an earlier SoP. There have been no amendments to this 2019 SoP as of the instrument's text provided. The RMA may revoke or amend it if new medical-scientific evidence emerges. The instrument does not contain a sunset clause. It remains in force until replaced.

The repeal of the 2011 SoP means that the factors changed. However, the new SoP retains some similar factors (prisoner of war, mental health, severe diarrhoea, stressors, childhood abuse) but with updated definitions and temporal windows. The 2011 SoP is not before us, so we cannot specify changes. The RMA's basis for determining the factors (section 8) is "sound medical-scientific evidence". This is a statutory requirement; if the evidence changes, the SoP must change.

This instrument, being a legislative instrument, does not cite any litigation. However, the broader reasonable hypothesis framework has generated substantial case law at the AAT and Federal Court on the application of SoPs. Cases such as Repatriation Commission v Deledio (1998) 83 FCR 82 established the four-step test for reasonable hypothesis, which interacts with SoPs. That case is not mentioned in this instrument, but practitioners must know it. The specific definitions in this SoP, such as "category 2 stressor" and "clinically significant disorder of mental health as specified", have been litigated in other SoP contexts. For example, the AAT has considered what constitutes "severe financial hardship" under similar stressor definitions. No case specifically interpreting this 2019 IBS SoP has been provided in the source, so we cannot comment further. Litigation risk exists for decision-makers who misapply the definitions, e.g., failing to recognise that "corpse" excludes closed body bags, or requiring actual management for mental health disorders when the note says it is not required.

Several traps exist. First, the diagnostic criteria for IBS in subsection 7(2) are specific and may not align with a clinical diagnosis. A doctor may diagnose IBS without formally applying the Rome IV criteria of pain one day per week for three months plus two of three associated features, with onset six months prior. If the evidence does not match subsection 7(2), the SoP cannot apply, even if the condition is functionally IBS. The ICD-10-AM code is noted but does not override the text.

Second, factor 15 ("inability to obtain appropriate clinical management") is a catch-all but is easy to misunderstand. It does not mean that the veteran simply failed to seek treatment. The inability must be related to service. It also does not specify a time window; presumably the inability must exist before clinical worsening (for worsening claims) or before clinical onset? The factor appears as factor 15, which is a worsening factor only (section 10(2)), so it cannot be used for onset claims. The text of section 9 does not specify a time; the note is absent. This creates uncertainty: how long must the inability have existed? The prudent approach is to require that the inability occurred within a reasonable period before the clinical worsening, but the SoP is silent.

Third, the temporal windows are strict. For onset: category 1A and 1B stressors must be within six months before onset; category 2 within one year; hostile environment within six months (cumulative four weeks); severe diarrhoea within six months; mental health disorder within six months; severe childhood abuse has no time window (but obviously must be before age 16, and before onset). For worsening: the same temporal windows apply, except category 2 stressor is still within one year before worsening. If the stressor occurred after the clinical onset but not within six months or one year before worsening, it cannot be used for worsening either.

Fourth, "severe childhood abuse" definition requires the harm was "perpetrated by a parent, a care provider, an adult who works with or around that child, or any other adult in contact with that child". This excludes abuse by peers or siblings if they are children. Also, "serious harm" is not defined; it raises a threshold issue.

Fifth, "episode of severe diarrhoea" must be assessed as caused by an infective organism. A veteran who had diarrhoea from food poisoning where no pathogen was identified may have difficulty proving it was infective. The alternative of lasting at least four days without medical attention is helpful but still requires a causal organism basis.

Sixth, the "clinically significant disorder of mental health as specified" requires the condition to be "of sufficient severity to warrant ongoing management". The note says actual management is not required, but the condition must be severe enough that management would be warranted. This is a hypothetical standard that may be difficult to prove retrospectively, especially if the veteran never sought treatment.

Seventh, claim for worsening using factors 9-15 requires that the IBS was suffered or contracted before or during (but did not arise out of) relevant service. If the IBS first manifested during a period of relevant service and was caused by that service, the worsening factors cannot apply; the onset factors must be used. But if the onset factors are not satisfied, the veteran is stuck.

Eighth, the dictionary definition of "eyewitness" in category 1B excludes persons exposed only to public broadcasting or mass media coverage. This prevents claims based on watching combat footage on television.

For practitioners representing veterans claiming IBS, the first step is to confirm the veteran's relevant service qualifies under the dictionary definition. Then obtain a medical report that explicitly diagnoses IBS using the Rome IV criteria set out in subsection 7(2). A generic "IBS" diagnosis is insufficient; the report must state that the veteran has had recurrent abdominal pain at least one day per week for at least three months, with at least two of the three associated features (defaecation, change in stool frequency, change in stool form), and symptom onset at least six months before diagnosis. The date of clinical onset must be identified.

Next, take a detailed history to identify any of the 15 factors. For each potential factor, gather corroborating evidence. For mental health disorders (factors 2 and 9), obtain a psychiatrist or psychologist report confirming a diagnosis from the list and that it was of sufficient severity to warrant ongoing management at the relevant time. The report should address the six-month window before clinical onset or worsening. For stressors, document the event precisely, ensuring it meets the category definitions. For category 2 stressors, the event must be chronic in nature, not a single incident. For hostile environment, document that the veteran lived or worked in a combat zone or under threat of artillery, etc., for at least four weeks cumulatively within six months before onset or worsening. For severe diarrhoea, obtain medical records showing an acute illness with frequent loose motions, cause by an infective organism, and that medical attention was sought or the illness lasted at least four days.

For childhood abuse, gather evidence of the harm and that it was perpetrated by an adult in a defined role. For prisoner of war, confirm captivity before onset. For inability to obtain appropriate clinical management, document specific barriers: remote posting, lack of specialists, denial of treatment, or financial constraints directly related to service conditions.

The relationship to service (section 10) must be established. The factor must have arisen out of the veteran's service. For example, a category 2 stressor of financial hardship must be due to service-related factors (e.g., loss of military employment). A stressor from childhood abuse unrelated to service cannot be linked unless the abuse itself was connected to service (e.g., abuse by a parent who was also a service member, and the abuse occurred in a service context, but that is unlikely).

For DVA decision-makers, compliance means checking each factor definition strictly. Do not accept a broad statement of "stress" without identifying the category. Ensure the temporal windows are met. For factors 9-15, confirm the IBS was not caused by service (otherwise use onset factors). For death claims, confirm the terminal event contributed to by IBS.

Record-keeping: maintain the clinical notes, stressor statements, service records, and any SoP cross-references. Prepare a written analysis showing which factor is satisfied and how it relates to service. The SoP does not require a particular form, but the reasoning must be transparent to withstand review.