Bipolar disorder is a mental health condition characterised by periods of depression and mania and/or hypomania. It impacts about 2% of people in Australia, with the World Health Organization estimating that around 37 millions people are impacted worldwide.
There are several types of bipolar disorder:
Bipolar I disorder - defined by the presence if a lifetime manic episode.
Bipolar II disorder - defined by the presence of a lifetime hypomanic episode and a period of depression.
Cyclothymia - defined by periods of less intense highs and lows.
Most people experience depression first, with this occurring during the early teens. Although many people experience their first hypomanic or manic episodes in their 20s, it is not uncommon to develop bipolar disorder earlier or later in life. Many people living with bipolar disorder report that they experience anxiety symptoms first, before depression or hypo/mania often during childhood.
Diagnosis is made on the basis of a clinical interview undertaken by trained practitioners. In Australia usually a psychiatrist will make a formal diagnosis of bipolar disorder. A diagnosis will be made based on diagnostic criteria, usually the DSM-5-TR or the ICD 11.
In Australia, most people living with bipolar disorder will be diagnosed with a sub-type of either Bipolar I or Bipolar II disorder, however people who were diagnosed prior to the acknowledgement of Bipolar II disorder may have had a diagnosis of 'Manic Depression'.
To obtain an accurate diagnosis in Australia, it is recommended that you obtain your diagnosis from a psychiatrist directly.
Symptoms of bipolar disorder that are unique to this condition include mania and hypomania, however depression is the most common symptom experienced.
Mania
In the DSM-5-TR, mania is defined by the presence of a period of at least 1 week or more and includes symptoms such as:
Elevated, expansive, or irritable mood (eg feeling on top of the world, high or excited)
Inflated self-esteem
Decreased need for sleep (eg only getting 4 hours of sleeping but feeling ok)
Racing thoughts
More talkative than usual
Increase in goal-directed activity
Risky or impulsive behaviour (eg excessive spending)
A lifetime episode of mania is required for the diagnosis of Bipolar I disorder. Psychosis can be common in mania, and many people report symptoms such as delusions that can occur with increasing severity when manic.
Many people find that they are first diagnosed after a manic episode that led to hospitalisation. Hospitalisation can be required to treat a severe manic episode as medication is needed to manage these symptoms.
Hypomania
Hypomania is defined as a period of 4 days in a row that have similar symptoms to mania, but are not severe enough to cause impairment or the need for hospitalisation.
People living with Bipolar II disorder are diagnosed on the basis of both depression and a hypomanic epsiode, however people living with bipolar I disorder may also have periods of hypomania.
Hypomania can sometimes be difficult to detect and diagnose which can mean that many people living with Bipolar II disorder can experience delays in diagnosis and treatment.
Depression
Depression is usually the most common symptom experienced for people living with bipolar disorder. A major depression episode lasts at least 2 weeks or more and includes symptoms such as:
Feeling sad, or low
Excessive feelings of worthlessness or guilt.
Increased sleep
Decreased or increased appetite or weight loss/gain
Difficulty concentrating
Thoughts of death or dying or suicide.
Depression symptoms can sometimes be ongoing and difficult to treat.
Mixed episodes or features
Mixed episodes are when symptoms of both depression and hypo/mania are experienced at the same time, within the same episode. This can look like having racing thoughts (symptoms of hypo/mania) and negative thoughts (symptom of depression) at the same time. Research has indicated that the prevalence of having mixed symptoms in a period of depression is around 12% and in hypo/mania around 27% (Na et al., 2021). Mixed symptoms in a major depression episode without a full episode of mania may also be a risk factor for the development of bipolar I or II disorder.
Rapid cycling
It is not uncommon for people living with bipolar disorder to experience multiple episodes known as 'rapid cycling'. In the DSM-5-TR, rapid cycling is defined as 4 or more episodes of depression or hypo/mania in the previous 12 months.
However many people living with bipolar disorder experience subsyndromal symptoms of hypo/mania or depression (those that do not meet full diagnostic criteria) often.
Other specifiers
There are several other specifiers that are stated in the DSM that may be important in the management and treatment bipolar disorder. eg Atypical features, melancholic features.
There is no known direct single cause of bipolar disorder. Research indicates that bipolar disorder has a genetic basis (Oliva et al 2025). However, although there is a strong genetic component, many people are diagnosed with bipolar disorder with no family history of the condition.
It is thought that bipolar disorder develops from a range of environmental factors, genetic and potential inflammatory alterations. Risk factors include perinatal impacts, stressful early life events, drug use, childhood trauma and certain medical conditions (Oliva et al 2025).
Environmental changes that may impact the development of bipolar disorder include seasonal changes, routine changes and changes to sleep/wake cycles (Oliva et al 2025). Examples of these may be time zone changes and shift work.
However the relationship between genes, risk factors and environment is still not well understood and much more research is needed to identify how these contribute to the development of the condition (Robinson and Bergen, 2021).
Guidelines for the treatment of bipolar disorder are published by the Royal Australians and New Zealand College of Psychiatrists. These guidelines cover a range of areas and treatment types.
Please note that the Bipolar Hub does not provide crisis support. If you are in crisis please call 000 for assistance.
GPs will have a list of local psychiatrists that they will be able to refer to for a diagnosis and assessment. However some people prefer to contact psychiatrists directly before seeing a GP to ensure that they have places available and to consider the waiting list length of the psychiatrist.
See the Resources section for links on how to locate a psychiatrist and other support and resources that can help.
For assistance in locating state-based government funded support, please visit:
https://www.healthdirect.gov.au/mental-health-crisis-support
https://www.medicarementalhealth.gov.au/
Please note that the Bipolar Hub does not provide crisis support
Crisis support Australia | Emergency Call: 000 New Zealand | Emergency Call: 111
Lifeline Australia – 13 11 14 Suicide Call Back Service – 1300 659 467.
Kids Helpline - 1800 55 1800 MensLine Australia - 1300 78 99 78 Beyond Blue - 1300 22 4636
https://www.suicidecallbackservice.org.au/
If your life is in danger please call emergency services 000.
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