Non-communicable diseases represent the predominant burden of disease in Australia and globally, accounting for the majority of morbidity and mortality. The classification distinguishes between acute conditions (sudden onset, short-term) and chronic conditions (gradual development, persisting beyond six months), with chronic diseases constituting a subset characterised by specific medical diagnoses and typically progressive deterioration. While the strict definition encompasses any disease not directly transmitted between persons, common usage treats NCDs as synonymous with chronic conditions. The epidemiological profile of NCDs in Australia reveals important nuances: prevalence data from 2022 show anxiety (18.9%) as the most prevalent condition overall, with marked variation by sex (arthritis ranking in the top five for females but not males) and age group (hearing loss being most prevalent among those aged 65 and over at 32.0%). These prevalence patterns differ substantially from mortality rankings — the top five causes of death in 2023 (ischaemic heart disease, dementia, cerebrovascular disease, lung cancer, chronic lower respiratory disease) reflect conditions with high case-fatality rates rather than high prevalence, since many prevalent conditions are compatible with long-term survival.

The four NCDs prioritised globally — cardiovascular diseases, cancer, chronic respiratory diseases, and diabetes — account for a disproportionate share of preventable death and disability. Age-standardised death rates are used to enable valid comparisons across populations with different age structures, removing the confounding effect of demographic variation. There is substantial geographic variation in NCD burden both internationally and within Australia, underscoring the influence of social, economic, and environmental determinants on disease distribution.

The major modifiable risk factors for NCDs are well-established: tobacco smoking, harmful alcohol consumption, inadequate nutrition, and physical inactivity, sometimes abbreviated collectively. Australian surveillance data demonstrate encouraging trends in smoking prevalence (declining across all age groups, though disparities persist by geographic remoteness, employment status, and country of birth) and concerning patterns in other risk factors. Alcohol consumption data from the 2022–2023 NDSHS reveal that males are more likely than females to drink at risky levels, and people born in Australia are more than twice as likely as those born overseas to exceed guidelines. Dietary surveillance indicates persistent failure to meet recommended fruit and vegetable intake across age groups. Physical activity guidelines recommend at least 150 minutes of moderate activity per week for adults, with strength training at least twice weekly. Body mass index (BMI) is used to classify weight status, with a BMI of 25–29.9 indicating overweight. For paramedic practice, understanding the prevalence, mortality patterns, and risk factor profiles of NCDs provides essential contextual knowledge for patient assessment and anticipating comorbidities in clinical encounters.