Physical health of people with mental illness
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Topic: Mental health
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AIHW
Australian Institute of Health and Welfare (2024) Physical health of people with mental illness, AIHW, Australian Government, accessed 11 September 2024.
APA
Australian Institute of Health and Welfare. (2024). Physical health of people with mental illness. Retrieved from https://www.aihw.gov.au/reports/mental-health/physical-health-of-people-with-mental-illness
MLA
Physical health of people with mental illness. Australian Institute of Health and Welfare, 24 July 2024, https://www.aihw.gov.au/reports/mental-health/physical-health-of-people-with-mental-illness
Vancouver
Australian Institute of Health and Welfare. Physical health of people with mental illness [Internet]. Canberra: Australian Institute of Health and Welfare, 2024 [cited 2024 Sep. 11]. Available from: https://www.aihw.gov.au/reports/mental-health/physical-health-of-people-with-mental-illness
Harvard
Australian Institute of Health and Welfare (AIHW) 2024, Physical health of people with mental illness, viewed 11 September 2024, https://www.aihw.gov.au/reports/mental-health/physical-health-of-people-with-mental-illness
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Physical health of people with mental illness
is an Australia's health
topic
People living with mental illness are more likely to experience poorer physical health than the general population.
People living with mental illness, and especially severe mental illness, tend to die earlier than the general population.
Almost 80% of premature deaths of people with mental illness are due to preventable physical health conditions.
People living with mental illness, and in particular severe mental illness (SMI), are more likely to experience comorbidity of physical conditions, more likely to be hospitalised for potentially preventable reasons and tend to die earlier than the general population (Sara et al. 2021; Lawrence et al. 2013).
For more information on mental illness, see the Prevalence and impact of mental illness.
Reporting on the physical health of people with mental illness
There is information on the prevalence of physical illness among people living with mental illness from population-based data sources, such as the National Study of Mental Health and Wellbeing (NSMHW), National Health Survey (NHS) and the Australian Bureau of Statistics (ABS) Census of Population and Housing (the Census). One challenge in reporting on the physical health of people experiencing mental illness is a lack of consistent health systems data. Initiatives and programs that monitor the physical heath of Australians with mental illness may provide insight, but they are not consistent across jurisdictions and different health settings.
How common is physical illness among people with mental illness?
According to the 2020–2022 NSMHW, an estimated 4.3 million Australians aged 16–85 years, or 22% of this population, had experienced a mental disorder in the 12 months prior to the study. Of these, 2 in 5 (39%) also had a long-term physical health condition. This represents an estimated 1.7 million people or 1 in 12 (8.4%) adults experiencing both a mental illness and a long-term physical health condition (ABS 2023).
The 2021 Census results – which include people of all ages – found that people who reported having a mental illness were more likely to report also having another long-term health condition (Figure 1) (ABS 2022). Among the most common long-term conditions reported by those with a mental illness were arthritis, asthma and diabetes (Figure 1). Given the Census relies on people self-reporting long-term conditions, this is likely to be an underestimate as many people did not respond to this item, may not be aware that they have a long-term health condition or their mental illness did not satisfy the requirements of being considered long-term (that is, lasting 6 months or longer). For more information, refer to Chronic conditions and multimorbidity for more information.
Figure 1: Long-term health conditions reported by persons with and without mental illness
Horizontal bar chart showing percentages of people with a mental illness and people without a mental illness who reported long-term health conditions (excluding mental illness) in the 2021 Census.
| Selected long term health condition | Persons with a mental illness | Persons without mental illness |
|---|---|---|
| Arthritis | 19.0% | 8.2% |
| Asthma | 19.0% | 7.8% |
| Cancer | 4.7% | 3.0% |
| Diabetes | 8.6% | 4.8% |
| Heart disease | 7.0% | 4.0% |
| Kidney disease | 2.0% | 0.9% |
| Lung condition | 4.7% | 1.6% |
| Stroke | 2.2% | 0.9% |
| Any other long-term health condition(s) | 20.0% | 7.6% |
1. Mental illness includes anxiety and depression.
2. Diabetes excludes gestational diabetes; Cancer includes remission; Heart Disease includes heart attack and angina; Lung condition includes Chronic obstructive pulmonary disease (COPD) or emphysema; Other long-term health condition(s)’ excludes dementia, Alzheimer’s disease and mental illness.
Source:
ABS 2022
A recent study of Australian general practice records examined the prevalence of physical health conditions and biomedical risk factors among people with severe mental illness (Belcher et al. 2021). Similarly, it showed a notable overlap between mental and physical illnesses. The prevalence of all surveyed biomedical risk factors was higher among patients with SMI than patients without. These included:
- dyslipidaemia (high cholesterol) (25% among those with SMI compared with 18% in patients without)
- hypertension (27% compared with 22%)
- obesity (29% compared with 19%).
The prevalence of all surveyed physical conditions was also higher among patients with SMI than patients without. These included:
- back pain (35% among those with SMI compared with 19% in patients without)
- cardiovascular disease (10% compared with 6.7%)
- gastro-oesophageal reflux disease (29% compared with 15%)
- arthritis (27% compared with 19%)
- cancer (19% compared with 15%).
Almost three-quarters (71%) of patients with SMI had at least one of the surveyed physical health conditions, compared with over half (54%) of people without.
The second National Survey of People Living with Psychotic Illness includes estimates on the physical health of Australians living with a psychotic illness (Morgan et al. 2012). Chronic back, neck or other pain was the most common chronic physical condition (32% compared with 28% for the general population) identified among people with a psychotic illness in 2010. Other common conditions included asthma (30% compared with 20% for the general population) and heart or circulatory conditions (27% compared with 16%).
In 2010, one-quarter (24%) of people with a psychotic illness were at high risk of cardiovascular disease, almost half (45%) were obese and almost two-fifths (38%) reported gaining weight as a medication side effect. Physical activity levels were markedly lower in people with a psychotic illness, with 96% classified as either sedentary or undertaking low levels of exercise in the previous week compared with 72% for the general population (Morgan et al. 2012).
Causes of physical illness among people with mental illness
Mental health is known to affect physical health and vice versa (Doan et al. 2023). For example, there is a long-established association between depression and heart disease. Multiple studies across various types of populations have shown that people with depression but no history of heart disease when the depression is assessed are at markedly higher risk for coronary heart disease or cardiac mortality (Carney and Freedland 2003).
Similarly, among patients who have just experienced a major cardiac event, such as a heart attack, those with depression are at an increased risk of another cardiac event or cardiac mortality compared to those without depression (Dhar and Barton 2016). While the association between depression and coronary heart disease is well known, researchers have only recently begun to understand the biological mechanisms behind this relationship (Dhar and Barton 2016).
Poor mental health can inhibit physical health behaviours – for example, it can lead to reduced physical activity or substance use as people try to self-medicate the symptoms of mental illness or psychological distress. Yet the reasons people with mental illness and especially SMI are more likely to experience poorer physical health and reduced life expectancy compared to the general population go beyond these mechanisms.
According to the Royal Australian and New Zealand College of Psychiatrists, the reasons people living with severe mental illness experience poorer physical health include:
- greater exposure to the known risk factors for physical disease such as lower socio-economic status, smoking, poor nutrition, reduced physical activity and higher sedentary behaviour
- reduced access to and quality of health care due to financial barriers, and stigma and discrimination among health care providers
- systemic issues in health care delivery, especially the separation of mental and physical health services, and a lack of clarity about who is responsible for monitoring the physical health of people with serious mental illness
- adverse effects of psychotropic medication, in particular their contribution to metabolic syndrome, obesity, cardiovascular disease and type 2 diabetes
- impacts from polypharmacy (the prescription of multiple medications) and prescribing practices
- lack of capability among both generalist and specialist health care staff to deal with complex comorbidities – mental health staff may lack skills, training and confidence to treat physical conditions and vice versa for physical health teams (RANZCP 2015).
For some people living with mental illness, symptoms may interfere with receiving medical care or compromise effective communication of physical symptoms with health care workers (Melamed et al. 2019).
In addition to poorer physical health and shorter life expectancy, higher rates of physical comorbidity among people with SMI can lead to higher levels of ongoing disability, reduced participation in the workforce and a greater likelihood of poverty and welfare dependency (RANZCP 2015).
Substance use can trigger or worsen mental health issues and is strongly associated with physical health conditions including cancer, cirrhosis, and cardiovascular disease (AIHW 2022). Among people living with mental illness, there are higher rates of alcohol, tobacco and other drug use compared with people without mental illness. For more information, refer to Alcohol, tobacco and other drug use in Australia – People with mental health conditions.
Substance use disorder (a type of mental disorder) is commonly associated with numerous physical health comorbidities as well as injuries from accidents, motor vehicle crashes and interpersonal violence (UNODC 2022). People living with substance use disorder are at increased risk of chronic illnesses such as cardiovascular disease, respiratory disorder and diabetes. As a population, this group:
- has higher rates of oral disease and nutritional deficiencies
- may suffer from comorbidities which are directly related to substance use (for example, cirrhosis of the liver from alcohol dependence or blood-borne virus from injecting drug use) (see Osborne et al. 2022).
Chronic pain, sexually transmitted infections, and COVID-19 (due to underlying vulnerabilities) are also associated with substance use disorders (UNODC 2022). Reduced access to health services and neglect of physical health concerns while using may also contribute to physical comorbidities in this population (Osborne et al. 2022).
Comorbidity between substance use disorder and other kinds of mental disorders is common (Mills et al. 2019; Plana-Ripoll et al. 2019). Yet compared to literature looking at comorbidity of mental illness with substance use disorder, there is limited research available on physical comorbidities among people in treatment for substance use disorder (Osborne and Kelly 2023).
Life expectancy
That people living with mental illness have a reduced life expectancy compared with the general population has been extensively documented around the world (Chang et al. 2011; Walker et al. 2015; Plana-Ripoll et al. 2019). Research from Western Australia found that the gap in life expectancy for people with mental illness registered with West Australian mental health services compared with the general population in 2005 was 15.9 years for men and 12.0 years for women (Lawrence et al. 2013). This research also indicated that the mortality gap for people living with mental illness had increased from 1985, by 2.5 years for men and 1.6 years for women since 1985, with the increase largely driven by gains in life expectancy for the general population (Lawrence et al. 2013). This finding aligns with studies from other high-income countries suggesting that the mortality gap for people with mental illness may be increasing over time, in part due to gains in life expectancy for the general population not experienced (or at least not experienced in equal measure) by those with mental illness and especially SMI (Neilsen et al 2013; Hayes et al 2017; Laursen et al 2019).
Rather than a direct result of mental illness or death by suicide, almost 80% of premature deaths of people with mental illness are due to potentially preventable physical health comorbidities (Lawrence et al. 2013). These include type 2 diabetes, respiratory diseases, cancer and cardiovascular disease (De Hert et al. 2009). Compared to the general population, people with SMI have a 2- to 3-fold risk of developing hypertension and metabolic syndrome and, if under the age of 50, a 3-fold risk of dying from coronary heart disease (De Hert et al. 2009; Osborn et al. 2007). If diagnosed with cancer, people living with SMI experience higher rates of mortality compared to the general population (Launders et al. 2022; Charlesworth et al. 2023).
Substance use disorder is particularly associated with reduced life expectancy. A recent study has shown that substance use disorder has a profound negative impact on mortality and years of life lost following the onset of comorbid physical health conditions when compared with people with the same physical conditions, but no history of substance use disorder (see Formanek et al. 2022). In 26 of the 28 physical health conditions surveyed, people with a history of hospitalisation for substance use disorder were more likely to die than their counterparts without this history, and for 7 of these conditions, this group had a risk of dying that was twice or higher (Formanek et al. 2022). People with mental illness are known to be at increased risk of premature mortality, but among all mental illness types, substance use disorder has been associated with the highest number of years of life lost (YLL) (Plana-Ripoll et al. 2019).
While mental illness is associated with poorer health outcomes and a reduced life expectancy, comorbid substance use disorder alongside other mental disorders is associated with markedly higher mortality rates and larger reductions in life expectancy (Plana-Ripoll et al. 2020). For more information on comorbidity of substance use disorders and other mental illness, see Mental health and substance use.
A number of data sources have indicated impacts on both the mental and physical health of Australians during the pandemic. As in other parts of the world, the pandemic and related restrictions had significant impacts on the mental health of Australians. Multiple sources of data indicated increased and more widespread psychological distress compared with pre-pandemic levels and increased use of mental health services and mental health prescriptions (ABS 2021; AIHW 2023; Biddle and Gray 2021; Butterworth 2020). Those aged 18–35 years, women, people with a disability, renters, and people who report having a mental health condition were more likely to report high or very high levels of psychological distress (ABS 2021).
Despite modifications and additions to health service delivery models during the pandemic (for example, telehealth consultations), many people delayed access to health care which can lead to acute and long-term health consequences (White et al. 2021). Issues included restrictions on movement during lockdowns, fear of contracting COVID-19, fear of overburdening the health system, financial stress and disruptions to elective surgery and other health services. Notably, people experiencing high levels of psychological distress were 6 times more likely to choose not to consult a health professional when needed than those who were not (Zhang et al. 2020).
For people living with SMI – a group which generally has less access to health care – pandemic-related restrictions may have worsened physical health(Melamed et al. 2020). People with SMI were already overrepresented in acute physical health care episodes in hospitals prior to the pandemic, therefore the burden placed on acute health care settings from the pandemic may have disproportionally affected this group (Melamed et al. 2020; Sara et al. 2021).
Future directions
Data linkage, for example through the National Health Data Hub (NHDH – formerly known as National Integrated Health Services Information or NIHSI), may provide further insights into the relationships between mental illness, physical comorbidities and mortality among the Australian population. While separate data collections provide a limited view on people's overall health, data linkage between collections allows for analysis of the impact of mental illness on physical health conditions from across different service settings and types of service usage. This data could assist in identifying areas of disadvantage in broader health settings and barriers to service usage for people with mental illness, which is critical as this population group accesses health services at a lower rate than the general population.
Where can I find more information?
For more information on the physical health of people with mental illness, refer to:
- Equally Well: Improving the physical health of people living with mental illness
- Victoria University: Being equally well roadmap
A national policy roadmap to better physical health care and longer lives for people living with serious mental illness. - The Royal Australian & New Zealand College of Psychiatrists: Expert consensus statement for the treatment, management and monitoring of the physical health of people with an enduring psychotic illness
- World Health Organization (WHO): Management of physical health conditions in adults with severe mental disorders
Key concepts
| Key concept | Description |
|---|---|
| Comorbidity | Comorbidity refers to occurrence of more than one condition/disorder at the same time. Comorbidity is common among those with mental illness. It can involve more than one mental disorder, or one mental disorder and one or more physical conditions. |
| Data linkage | Data linkage brings together information derived from different sources but relating to the same individual, place or event in a single file. Data linkage has been used for studies of epidemiology, health service outcomes and use, and needs analysis. |
| Metabolic syndrome | Metabolic syndrome is an accumulation of health conditions, which together raise the risk of an individual developing atherosclerotic cardiovascular disease, insulin resistance, and diabetes mellitus, and vascular and neurological complications such as a cerebrovascular accident. |
| Mortality gap | Mortality gap is the disparity in life expectancy between the general population and a specific group of interest. |
| Severe mental illness (SMI) | Severe mental illness – often used interchangeably with the terms serious mental illness and severe and persistent mental illness – commonly includes diagnoses of schizophrenia, major affective disorders and some personality disorders resulting in lifelong disabling conditions that severely impair personal and social functioning and require ongoing and long-term support and treatment. These terms lack consensus definition but are commonly characterised by the combination of diagnosis, disability and duration (see Zumstein and Riese 2020). |
| Substance use disorder | Substance use disorder is the persistent use of drugs (including alcohol and tobacco) despite serious harms and negative consequences associated with their use. In the International Statistical Classification of Diseases and Related Health Problems,10th revision, substance use disorders come under the block Mental and behavioural disorders due to psychoactive substance use. This block contains a wide variety of disorders that differ in severity and clinical form but that are all attributable to the use of one or more psychoactive substances, which may or may not have been medically prescribed. |
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This section was last updated 24 July 2024