Statement of Principles concerning chronic fatigue syndrome (Reasonable Hypothesis) (No. 105 of 2021)

This instrument is a Statement of Principles (SoP) concerning chronic fatigue syndrome (CFS) determined under subsection 196B(2) of the Veterans' Entitlements Act 1986 (VEA). It replaces the previous SoP No. 11 of 2014 and came into effect on 22 November 2021. Its legal function is to specify the minimum factors that must exist before it can be said that a reasonable hypothesis has been raised connecting CFS (or death from CFS) with the circumstances of a person’s relevant service under the VEA or the Military Rehabilitation and Compensation Act 2004 (MRCA). The SoP does not itself grant or deny compensation; rather, it creates a standard of proof that decision-makers must apply when assessing claims where a veteran or member asserts that CFS is service-related. The instrument defines CFS with a strict set of diagnostic criteria (section 7(2)), lists six possible causal factors (section 9), and provides detailed definitions in Schedule 1 of key terms such as "category 1A stressor", "category 1B stressor", "hostile or life-threatening environment", "severe childhood abuse", and "specified list of infections". The SoP operates under a "reasonable hypothesis" standard rather than a "reasonable satisfaction" standard, meaning the threshold for connection to service is lower: the factors need only be consistent with the available medical‑scientific evidence and not be contrary to proven facts. Mechanically, the instrument repeals the earlier SoP, so any claim lodged after commencement must be assessed under the new criteria. It applies to claims under section 120A of the VEA and section 338 of the MRCA. The RMA’s basis for determining the factors is set out in section 8: there is sound medical‑scientific evidence that CFS can be related to relevant service. This is a claim by the RMA; the instrument does not explain the content or quality of that evidence.

The central concept is "chronic fatigue syndrome" as defined in subsection 7(2). The definition requires a new or definitive onset of severe fatigue that is not improved by bed rest and may be worsened by physical or mental exertion, persisting for at least six consecutive months not due to ongoing exertion, with other mental or physical conditions ruled out, and significantly interfering with daily activities and work. Additionally, the individual must concurrently have four or more of eight listed symptoms: post-exertion malaise lasting more than 24 hours, unrefreshing sleep, significant impairment of short-term memory or concentration, muscle pain, joint pain without swelling or redness, headaches of a new type pattern or severity, tender lymph nodes in the neck or armpit, or a frequent or recurring sore throat. The definition includes notes: the additional symptoms must have persisted or recurred during six or more consecutive months and cannot have first appeared before the fatigue, and other conditions that can be associated with severe chronic fatigue include depressive disorder, bipolar disorder, alcohol use disorder, substance use disorder, schizophrenia, eating disorders, dementia and morbid obesity. The definition is deliberately narrow and excludes fatigue caused by other identifiable medical conditions. "Reasonable hypothesis" is not defined in the instrument but is a standard known from the VEA: a hypothesis that is reasonable, having regard to the SoP factors, and not contrary to proved facts. The six factors in section 9 are: (1) having an acute infection from a specified list (Coxiella burnetii, Epstein-Barr virus, Giardia lamblia, parvovirus B19, Ross River virus) at the time of clinical onset; (2) living or working in a hostile or life-threatening environment for at least four weeks within the six months before clinical onset; (3) experiencing severe childhood abuse before clinical onset; (4) experiencing a category 1A stressor within one year before clinical onset; (5) experiencing a category 1B stressor within one year before clinical onset; (6) inability to obtain appropriate clinical management for CFS. The definitions of stressors and hostile environment are specific and exclude more general traumatic events. The concept of "relevant service" is defined broadly in the dictionary and includes operational service, peacekeeping service, hazardous service, British nuclear test defence service under the VEA, and warlike or non-warlike service under the MRCA. Section 10 requires that the existence of any factor must be related to the relevant service rendered by the person, and the factor of inability to obtain appropriate clinical management applies only to material contribution to or aggravation of CFS where the condition was suffered or contracted before or during but did not arise out of service.

The primary persons affected are veterans and members of the Australian Defence Force who render "relevant service" as defined in Schedule 1 of the instrument. This includes those who have performed operational service, peacekeeping service, hazardous service, or British nuclear test defence service under the VEA, and those who have performed warlike or non-warlike service under the MRCA. The instrument also applies to claims for death from CFS where the terminal event was contributed to by the person’s CFS. Therefore, family members or dependents who lodge claims for compensation after the death of a veteran or member are also affected indirectly. The SoP binds decision-makers within the Department of Veterans’ Affairs and the Military Rehabilitation and Compensation Commission when assessing claims under sections 120A of the VEA and 338 of the MRCA. It also provides the framework for the Veterans’ Review Board, the Administrative Appeals Tribunal, and ultimately the Federal Court when reviewing such decisions. Legal practitioners, advocates, and medical professionals who assist claimants must understand the specific definitions and factors to advise on whether a claim can succeed. The instrument imposes no direct obligations on private individuals or businesses; it does not create duties or rights outside the veterans' compensation system. However, it affects the allocation of public resources: each successful claim results in a government liability for compensation, medical treatment, or other benefits. The tight diagnostic criteria and narrow factors likely reduce eligibility compared to a broader medical definition, meaning some veterans with fatigue of unclear origin will not meet the threshold. The requirement to "rule out" other mental or physical conditions places a significant evidentiary burden on claimants, particularly where access to diagnostic testing is limited, and may create uncertainty if a veteran has comorbid conditions that are difficult to disentangle. The definitions of stressors and hostile environment are tied to combat or direct threats, which may exclude veterans whose service involved high stress but not direct life-threatening situations, such as certain types of peacekeeping or logistical support roles.

The instrument does not impose duties on individuals or organisations in the ordinary sense. Its legal effect is evidentiary: it sets out what must be established for a reasonable hypothesis to exist. The key "duty" is on the decision-maker to apply the SoP correctly when assessing a claim. Under the VEA and MRCA, the standard of proof for claims relating to operational or warlike service is the "reasonable hypothesis" standard: the claim succeeds unless the decision-maker is satisfied beyond reasonable doubt that there is no sufficient ground for the hypothesis. The SoP controls which hypotheses are reasonable. The rights of the claimant include the right to have the claim assessed under the current SoP, the right to be informed of the factors that must be established, and the right to seek review of an adverse decision. Section 9 states that at least one of the listed factors "must as a minimum exist" before it can be said that a reasonable hypothesis has been raised. This is a mandatory requirement: if no factor is established, the hypothesis is not reasonable. Section 10 then requires that the factor be related to the person’s relevant service. For factors 9(1) to (5), the factor itself must be related to service (e.g., the acute infection was contracted during service, the hostile environment was encountered during service, the childhood abuse may be unrelated to service but note the factor must still be related to service , this creates a tension: severe childhood abuse before service is not itself related to service. The instrument does not explain how the relationship is established for factor 9(3); presumably it would require a connection through the person’s service experience such as a stressor that recalls or exacerbates abuse, but the text is ambiguous. Factor 9(6) (inability to obtain appropriate clinical management) is specifically limited to material contribution or aggravation of CFS that was already present before or during service but did not arise out of service. This means a veteran who develops CFS for the first time after service cannot rely on this factor for initial onset. The dictionary defines key terms, and decision-makers must give those terms their defined meaning, not a clinical or ordinary meaning. The claimant has a right to know whether the definitions are met and to provide evidence accordingly. The instrument creates no private rights of action or contractual duties.

This instrument contains no penalties, fines, or enforcement mechanisms. It is a legislative instrument that sets evidentiary standards, not a regulatory scheme with punitive provisions. The VEA and MRCA contain penalties for fraud or false statements in claims, but those are not addressed here. The "enforcement" of the SoP occurs through administrative decision-making and subsequent merits and judicial review. If a decision-maker fails to apply the SoP correctly, the applicant can seek review by the Veterans’ Review Board (VRB), which must itself apply the SoP. If the VRB errs, further appeal can be made to the Administrative Appeals Tribunal (AAT) and then to the Federal Court on a question of law. The practical penalty for a decision-maker is the risk of the decision being set aside or remitted for reconsideration, which carries administrative costs and potential liability for back‑payments if the original denial was incorrect. For the government, an incorrect application of the SoP (either overly generous or overly strict) can lead to either unnecessary expenditure or successful appeals that generate legal costs and reputational harm. The SoP itself does not authorise any investigation or punishment; it simply defines the circumstances under which a reasonable hypothesis exists. The RMA is not an enforcement body; its role is to determine SoPs based on sound medical‑scientific evidence. There is no provision for penalties if a claimant fails to meet the diagnostic criteria; the only consequence is that the claim will be refused. Similarly, there is no penalty for a medical practitioner who provides a diagnosis that does not align with the SoP’s definition; the practitioner’s opinion may be given less weight, but the instrument does not regulate professional conduct.

The SoP operates within the framework of the VEA and the MRCA. Section 120A of the VEA requires the RMA to determine SoPs for certain kinds of injury, disease, or death, and provides that a reasonable hypothesis cannot be raised if it is inconsistent with the relevant SoP. Section 338 of the MRCA has a similar effect. Thus, this instrument effectively controls the outcome of claims for CFS under both Acts. It replaces the previous SoP No. 11 of 2014, so any claim assessed after 22 November 2021 must be determined under the new instrument. The SoP also interacts with other SoPs: section 11 provides that if a factor in section 9 refers to an injury or disease for which another SoP has been determined under subsection 196B(2) of the VEA, then the factors in that other SoP apply as in force from time to time. For example, factor 9(1) refers to "an acute infection from the specified list of infections". If a person claims that they had Q fever, which is itself a disease covered by another SoP, the decision-maker must also consider the factors in the Q fever SoP to determine whether the Q fever is related to service. This creates a cascading application of SoPs. The instrument does not interact with state workers' compensation or motor accident schemes, as it is specific to Commonwealth veterans' compensation. It also does not directly affect private insurance or superannuation disability definitions, although a claimant might use a favourable determination under this SoP to support private claims. The definition of CFS in the SoP may differ from definitions used by the World Health Organization, the CDC, or clinical guidelines. The instrument does not purport to be a diagnostic tool for clinical purposes; it is purely for compensation assessment. This can create tension: a veteran may be diagnosed with CFS by a specialist using broader criteria but still fail to meet the SoP definition, leading to a denial of compensation despite clinical recognition. The SoP's six‑month duration requirement and mandatory exclusion of other conditions impose a higher threshold than some clinical criteria.

The instrument itself does not contain an amendment history. It was made on 22 October 2021 and commenced on 22 November 2021. It repealed the previous SoP concerning chronic fatigue syndrome (Reasonable Hypothesis) No. 11 of 2014 (registered as F2014L00013). The instrument has not been amended since commencement. There are no explanatory materials in the source that discuss why the factors were changed from the 2014 SoP. However, the fact that a new SoP was issued suggests the RMA considered that the medical‑scientific evidence had evolved sufficiently to warrant a fresh determination. The 2014 SoP presumably had different definitions or factors; a researcher would need to locate that instrument to identify specific changes. The repeal of a previous SoP is a standard process under the VEA; SoPs are reviewed periodically and replaced when the RMA determines that the state of medical knowledge has changed. Note that the instrument is silent on transitional arrangements: it says it applies to claims to which section 120A of the VEA or section 338 of the MRCA applies. This would include claims lodged before commencement if they were not yet finally determined, subject to the usual transitional provisions in the VEA and MRCA. Generally, the SoP in force at the time of the decision applies, not the one in force when the claim was lodged. Therefore, any claim for CFS decided after 22 November 2021 must be assessed under the new SoP. This may disadvantage claimants whose claims had progressed partway under the old SoP, as the goalposts may have shifted. No amendment history is provided because the instrument is a standalone determination, not an amending act.

The source text does not mention any litigation relating to this specific instrument. The SoP is a legislative instrument, not a court decision, so there is no "litigation history" for the instrument itself. However, it is reasonable to infer that the previous SoP (No. 11 of 2014) may have been considered in decisions of the AAT or Federal Court, but the source does not provide those cases and we cannot invent them. The instrument's definition of chronic fatigue syndrome and the factors could be subject to judicial review in the future. A claimant might argue that the SoP is unreasonable or ultra vires the VEA if they contend that the RMA did not base the factors on sound medical‑scientific evidence, or that the definitions exclude a recognised sub‑type of CFS. The High Court has considered challenges to SoPs in other contexts (e.g., Repatriation Commission v. Hill), but no such challenge specific to CFS is cited. The instrument itself is not litigated; rather, decisions applying it are litigated. In practice, the Veterans' Review Board and AAT hear many cases where the issue is whether a veteran meets the diagnostic criteria or has established a factor. Over time, a body of case law will develop interpreting specific definitions such as "severe childhood abuse" and "hostile or life-threatening environment". For example, the definition of "hostile or life-threatening environment" is limited to experiencing or being under threat of artillery, missile, rocket, mine or bomb attack, nuclear biological or chemical attack, or being involved in combat or going on combat patrols. This likely includes service in a war zone but excludes peacekeeping in relatively stable environments. The term "combat patrols" may be litigated to determine whether a logistics patrol in a hostile area qualifies. Similarly, "eyewitness" is defined as a person who experiences an incident first hand and can give direct evidence, excluding exposure to media coverage. The definition of "corpse" excludes closed body bags and open‑casket coffins. These fine‑grained distinctions are ripe for interpretation. However, since the instrument commenced only in 2021, there is insufficient time for extensive litigation to have been reported.

Several features of the instrument could trip up claimants and their advisers. First, the diagnostic criteria in section 7(2) are strict and require the ruling out of other mental and physical conditions. Note 2 lists depressive disorder, bipolar disorder, alcohol use disorder, substance use disorder, schizophrenia, eating disorders, dementia of any type, and morbid obesity. If a claimant has a history of depression, even if well‑treated, the decision‑maker may argue that the fatigue is attributable to depression and not CFS. The claimant must provide evidence that fatigue persisted despite treatment and after the depression was ruled out. Second, the requirement that the fatigue "significantly interferes with daily activities and work" is a high threshold; mild fatigue that reduces efficiency but does not prevent daily tasks might not qualify. Third, the factor of "severe childhood abuse" (factor 9(3)) requires that the harm was perpetrated by a parent, care provider, an adult who works with or around the child, or any other adult in contact with the child. Abuse by a sibling or peer who is a minor is not covered. The abuse must be "severe" and involve serious harm or neglect. The relationship to service is problematic: childhood abuse predates service, so how can it be related to service? The only plausible connection is if the veteran's service experience reactivated the trauma, but the instrument does not say that. The factor simply says "experiencing severe childhood abuse before the clinical onset of chronic fatigue syndrome". Section 10 requires the factor to be related to the relevant service. The instrument does not explain how childhood abuse is related to service. This may mean the factor is rarely successful unless the veteran can show that the abuse was caused or exacerbated by service (e.g., a defence‑related deployment that caused separation from an abusive parent? Unlikely). The intent may be that the abuse is a risk factor for CFS, but the relationship to service must still be shown. Fourth, factor 9(6) (inability to obtain appropriate clinical management) applies only to material contribution or aggravation of CFS that existed before or during service but did not arise out of service. If a veteran develops CFS for the first time after service, this factor cannot be used. It also requires that the inability to obtain management was due to service circumstances. Fifth, the "specified list of infections" is short: only five infections. Many other infections that are associated with CFS in the literature (e.g., Lyme disease, certain enteroviruses) are not included. A veteran who had a non‑listed infection cannot rely on factor 9(1). Sixth, the "hostile or life-threatening environment" factor requires at least four weeks of exposure within the six months before clinical onset. A single traumatic event, such as a bomb blast, would not meet the duration requirement unless the veteran was in that environment continuously for four weeks. Seventh, the stressor factors (9(4) and 9(5)) require the stressor to occur within one year before clinical onset. If the CFS onset is gradual and not clearly pinpointed, the timing may be difficult to prove. Finally, the instrument applies to claims under the VEA and MRCA, but not to claims under the Safety, Rehabilitation and Compensation Act 1988 (SRCA) for civilian employees; separate SoPs exist for those claims, and the criteria may differ.

For a claimant seeking compensation for CFS, the first step is to obtain a diagnosis that strictly matches the SoP definition. That means seeing a doctor who is aware of the criteria and can document: (a) new onset of severe fatigue not improved by bed rest and worsened by exertion; (b) persistence for at least six consecutive months; (c) exclusion of other mental and physical conditions that cause fatigue; (d) significant interference with daily activities and work; and (e) four or more of the eight specified symptoms persisting or recurring for six months. The doctor should note that the symptoms did not appear before the fatigue. The claimant must also undergo relevant diagnostic testing to rule out conditions such as hypothyroidism, anaemia, diabetes, sleep apnoea, and mental health disorders. A diagnosis of CFS by a GP or specialist using broader clinical criteria may not suffice if it does not address each element. The claimant must then identify which of the six factors in section 9 applies and gather evidence that the factor is related to their service. For factor 9(1), evidence of the specific infection (e.g., positive serology for Epstein-Barr virus or Q fever) at the time of clinical onset. For factor 9(2), evidence of posting or deployment to a hostile environment for at least four weeks within six months before onset. This could include service records, operational orders, or patrol logs. For factors 9(3), (4), and (5), evidence of the stressor or abuse, which may require psychological reports, service incident reports, or corroborating statements. The claimant must also show the chronological relationship: onset within one year of the stressor, or before clinical onset for childhood abuse. For factor 9(6), the claimant must show that the CFS existed before or during service (not arising out of service) and that the inability to obtain appropriate clinical management was due to service (e.g., posted to a location without adequate medical facilities). The claimant should be aware that the onus is on them to raise the hypothesis; the decision‑maker then must be satisfied beyond reasonable doubt there is no sufficient ground. The instrument does not require a definitive causal link; it only requires a reasonable hypothesis consistent with the factor. Documentation is critical: contemporaneous medical records, service records, and statements from witnesses. Claimants should also be prepared for the possibility that the decision-maker may reject the claim on the basis that the fatigue is due to a comorbid condition such as depression, even if the claimant believes the fatigue is independent. To avoid this, a psychiatrist or psychologist should provide an opinion that the fatigue is not better explained by a mental health condition. For advocates and legal practitioners, the key is to match the facts to the narrow definitions and to argue that the instrument should be interpreted beneficially for the claimant, consistent with the remedial purpose of veterans’ legislation. However, the text is precise, and a factor that does not fit the definition cannot be relied upon. Regular review of AAT and Federal Court decisions applying this SoP will help identify how the definitions are being interpreted. Compliance is about evidence gathering and precise matching; there is no ongoing burden after claim determination.