Mental illness refers to a clinically significant disturbance in an individual’s cognition, emotional regulation, or behaviour, usually associated with distress or impairment in important areas of functioning (WHO 2022).

This part of the website provides information on the prevalence of mental illness and gives an overview of Australia’s mental health system. The AIHW collects, analyses and reports on a broad range of mental health-related data and information and updates this site as new data becomes available.