Mental illness: facts and figures
How many people experience mental illness?
Twenty per cent of adults are affected by some form of mental disorder every year. Anxiety disorders and depression are the most common mental illnesses. The remainder are affected by psychotic conditions such as schizophrenia and bipolar disorder, by eating disorders and other diagnoses.
How many people are seriously affected by mental illness?
Three per cent of adults are affected by a severe mental disorder every year. The ‘severe mental disorders’ include schizophrenia, bipolar disorder and other forms of psychosis, some forms of depression, and anxiety disorders such as panic disorder and obsessive-compulsive disorder. Schizophrenia is a persistent form of mental illness that affects approximately one per cent of Australians at some stage in their lives. Bipolar disorder affects up to 2 per cent of Australians at some time in their lives. Depression affects about 20 per cent, and anxiety disorders about 10 per cent at some time in life.
Does mental illness run in families?
Most people with a mental illness do not have family members with the illness. For some mental disorders there does not seem to be a link at all. For others, such as schizophrenia and bipolar disorder, a predisposition to the illness may be inherited — but even then it is only one of several factors. The causes are not fully understood. It is likely that such mental disorders involve a biochemical imbalance and can be triggered by such things as stressful life events, drug abuse, hormonal changes or physical illness.
Is mental illness life-threatening?
Mental illness itself is not life-threatening. However, up to 12 per cent of those seriously affected eventually kill themselves (compared to an average of one per cent for the whole population). Effective, ongoing treatment is essential to minimise the risk of suicide.
What are the chances of recovering from mental illness?
Most people with mental illness recover well and are able to lead fulfilling lives in the community, when they receive appropriate ongoing treatment and support. However, only about half of those affected actually receive treatment. The majority of people who develop anxiety disorders improve over time with appropriate treatment and support. About 80 per cent of people diagnosed with bipolar disorder also improve with ongoing treatment and support. The long-term outcome for schizophrenia can be better than many assume, especially where access to good treatment is consistent. About 20 per cent of those diagnosed have an episode or 2, then never experience symptoms again. About 60 per cent improve over time and, with support, can live independently. For about 20 per cent, symptoms are more persistent, treatments are less effective, and greater support services are needed.
Last Reviewed: 01 January 2005
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