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There is a wide range of mental illnesses and these vary in severity and duration. Not only can mental illness negatively impact individuals and their families, but its influence is also far-reaching for society. Social problems commonly associated with mental illness include financial stress, unemployment and homelessness. People with mental illness often experience problems such as isolation, discrimination and stigma.

Based on finding from the 2020–2022 National Study of Mental Health and Wellbeing (ABS 2023), the most commonly reported mental disorders among Australians in the 12 months prior to the survey were:

• Anxiety disorders (3.4 million people, or 17% of the population)
• Affective disorders (1.5 million, or 8%)
• Substance Use disorders (650,000, or 3%).

The AIHW estimates that for 2022–23 around $13.2 billion was spent on mental health-related services in Australia. Services include residential and community services, hospital-based services (both inpatient and outpatient), and consultation with specialists and general practitioners. For more data and information, refer to Expenditure on mental health services.

The AIHW also provides data analytical support to the National Mental Health Commission and participates in various national mental health committees.

ABS (Australian Bureau of Statistics) (2023) National Study of Mental Health and Wellbeing, ABS, Australian Government, accessed 21 January 2026.

WHO (World Health Organization) (2025) Mental disorders, WHO, accessed 21 January 2026.