Identifying priority health issues: social justice principles, priority population groups, prevalence of condition, potential for prevention and early intervention, costs to the individual and community

Australia does not just pick the worst diseases as its priorities. The selection process applies five criteria from the syllabus. Together they explain why mental health and Aboriginal and Torres Strait Islander health are National Health Priorities, but why (for instance) celiac disease is not.

The five criteria

Social justice principles

The three social justice principles - equity, diversity, and supportive environments - are the starting point. They shift the question from "what kills the most Australians" to "what creates unfair health outcomes for some Australians".

Equity says like need should get like care. The 7-8 year Indigenous life expectancy gap, the 2x higher infant mortality for Indigenous infants, and the lower mental health service uptake in CALD communities are all equity violations and are all flagged as priorities for that reason.

Diversity says different groups have different needs. A one-size-fits-all health system will fail groups whose needs sit outside the average. This identifies priorities specific to women (cervical cancer screening), older Australians (dementia care), and people with disability (preventive health access).

Supportive environments says health is partly created by the place you live. Identifying environments that undermine health (housing instability, food deserts, exposure to violence) is the basis for priority frameworks like the National Preventive Health Strategy.

Priority population groups

The syllabus expects you to know the priority population groups: Aboriginal and Torres Strait Islander peoples, people in low socioeconomic groups, people in rural and remote areas, overseas-born people, the elderly, and people with disability.

A health issue becomes a priority when it affects one of these groups disproportionately. Suicide rates in Australia are concerning overall, but they are roughly twice as high for Aboriginal and Torres Strait Islander people, three times as high in very remote areas compared to major cities, and twice as high for men compared to women (AIHW Suicide and self-harm monitoring 2024). The disproportionality across priority groups is what flagged youth suicide as a National Health Priority Area in 1996 and kept mental health as one ever since.

Prevalence of condition

How widespread is the condition? Prevalence tells governments whether the problem is large enough to justify population-level intervention. Cardiovascular disease affects roughly 1 in 6 Australians, diabetes affects 1 in 10, and mental and behavioural conditions affect roughly 1 in 5 Australians in any given year (ABS National Health Survey).

Prevalence is necessary but not sufficient. A condition with low prevalence but huge severity (e.g., motor neurone disease) still gets attention; a condition with high prevalence but low severity (e.g., the common cold) does not get priority status. Prevalence is one factor among five.

Potential for prevention and early intervention

The fourth criterion is whether something can actually be done. Health authorities prioritise issues where prevention or early intervention demonstrably works.

Smoking is the canonical example. Smoking rates in Australia have fallen from 25% of adults in 1995 to roughly 10% in 2023 (AIHW 2024) through a sustained mix of taxation, plain packaging, advertising bans, and quit programs. That track record of effective prevention is part of why tobacco control remains a priority area despite already-reduced rates.

Type 2 diabetes is similarly framed. The disease is largely preventable through diet and exercise, so prevention investment is justifiable. Type 1 diabetes is not prioritised in the same way because the prevention pathway is much less clear.

Costs to the individual and community

Costs come in two forms.

Direct costs are the dollars spent on treatment: GP visits, hospital admissions, medication, allied health, residential care. Australian health system spending exceeds $240 billion a year, with cardiovascular disease, mental health, and musculoskeletal conditions among the largest line items (AIHW Health Expenditure Australia).

Indirect costs are everything else: lost productivity, premature death, caring burden on family members, reduced quality of life. The Productivity Commission estimated mental ill-health costs the Australian economy roughly $200 billion a year when productivity loss is included.

A condition becomes a priority when the combined costs justify population-level intervention. Mental health's high indirect costs are part of why it remains a top National Health Priority Area despite (or because of) the difficulty of measuring direct treatment effectiveness.

How the criteria combine

A condition does not need to score high on every criterion to become a priority. Cardiovascular disease wins on prevalence and cost and prevention potential. Indigenous health wins on social justice and priority groups. Mental health wins on prevalence, costs, and the social justice (CALD, young men) lens.

In an HSC extended response, the strongest answers cite the criterion explicitly, give the Australian data point, and identify the priority that follows.