Australia's health trends: what the data shows

Australian health data tells a genuinely mixed story. People are living longer, and more of those years are being spent in poor health.

What the burden of disease data shows

The Australian Institute of Health and Welfare measures the total impact of illness and premature death across the population — the burden of disease. Its most recent work found that over a third of that burden could be avoided or reduced by modifying risk factors.

That figure is the whole argument for prevention in a single number. A third of the country's illness and early death is, in principle, addressable.

The leading risk factor has changed

In 2024, overweight including obesity overtook tobacco as the leading risk factor contributing to ill health and death in Australia. It accounted for 8.3 per cent of total disease burden, against 7.6 per cent for tobacco use.

The reason for the swap is worth noting: it happened largely because tobacco's contribution fell substantially, with the age-standardised burden attributable to smoking dropping by around 41 per cent since 2003. Daily smoking among Australians aged 14 and over declined from 11 per cent to 8.3 per cent between 2019 and 2022–23.

That is a genuine public health success, and it is what a sustained prevention effort looks like over two decades.

Where the burden now sits

After overweight and tobacco, dietary risks account for 4.8 per cent of total burden and high blood pressure 4.4 per cent, making high blood pressure the fourth leading risk factor. Around two in three Australian adults are living with overweight or obesity.

More than one in two Australians live with a chronic condition, frequently more than one.

The pattern underneath the numbers

What these figures describe is a shift in the nature of the problem. Treatment has improved considerably — survival after cardiovascular events, cancer outcomes, management of chronic conditions have all advanced. People live longer as a result.

But the risk factors driving those conditions have not moved in the same direction. Body weight, diet and blood pressure are all measurable, all modifiable in principle, and all trending unhelpfully. So the years gained are increasingly years lived with illness rather than years lived well.

Why this matters for testing

Several of the leading risk factors are things you cannot feel. High blood pressure produces no symptoms. Neither does high cholesterol, or blood glucose rising toward the diabetic range. They are detected by measurement or not at all.

That is the practical link between population statistics and an individual decision. The risk factors doing the most damage nationally are, for the most part, silent ones — which is why knowing your own numbers is worth something, and why waiting for symptoms is a strategy with an obvious flaw.

What the data doesn't say

• Population trends aren't personal predictions. National figures describe averages, not individuals.
• Association isn't causation. Risk factor data identifies patterns, not mechanisms in any one person.
• Testing isn't prevention by itself. Measuring something changes nothing unless it informs a decision.
• Statistics date. Figures here reflect the most recent AIHW reporting and will shift as new data is published.

The bottom line

Australians are living longer while spending more of those years unwell, and roughly a third of the national disease burden is attributable to things that can be modified. Most of the leading risk factors produce no symptoms until they have done considerable damage.