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Suicide among autistic individuals

Social issue

  • 22 min read
  • 5 chapters

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Through Medical diagnosis, Belgium and Social exclusion

The underlying causes of this increased risk are currently under investigation. Survivor accounts frequently reference feelings of being perceived as a burden, internal conflict related to autism, psychological trauma, and fatigue associated with masking autistic traits in social contexts. Additional risk factors include experiences of bullying, delayed diagnosis, and high intellectual ability. These risks are often under-recognized by clinicians and family members. The high number of assisted suicide requests by autistic individuals in countries such as Belgium and the Netherlands has prompted debate regarding the adequacy of social and healthcare support systems for autistic people.

Evidence suggests that fostering self-esteem and enhancing social inclusion can contribute to reducing suicide risk within the autistic population.

Statistics and facts

The suicide rate among autistic individuals is widely recognized as significantly higher than in the general population and is considered one of the leading causes of death within this group. Reported rates vary depending on the methodology used and the country in which the research is conducted. Part of this variability stems from differences in the measurement tools employed, particularly those that do not differentiate between suicide attempts and non-suicidal self-injurious behavior.

Several studies conducted between 2014 and 2017, particularly in the United Kingdom, reported suicide rates approximately six times higher among autistic individuals compared to the general population. A 2016 Swedish study found the rate to be 7.5 times higher.

According to a 2017 report by the National Institute of Public Health of Quebec, the suicide rate among autistic youth under the age of 24 was twice that of their non-autistic peers. A similarly elevated rate was observed in Utah among autistic youth between 2013 and 2017. A controlled study in Taiwan involving 5,218 autistic adolescents reported a suicide attempt rate of 3.9%, compared to 0.7% in the control group.

A Danish cohort study involving over 6.5 million individuals over a 10-year period concluded that individuals diagnosed with autism spectrum disorder (ASD) have a risk of suicide attempts and suicide more than three times higher than the general population. Within the cohort, 35,020 individuals had a confirmed ASD diagnosis; among them, 587 (0.9%) attempted suicide, and 53 died by suicide.

Similar rates were observed among individuals exhibiting autistic traits but without a formal diagnosis. In England, a separate analysis of individuals who died by suicide found a significant overrepresentation of autistic characteristics.

Rates of suicidal ideation

A 2023 systematic review and meta-analysis conducted by Victoria Newell and collaborators found that suicidal ideation affects 34.2% of autistic and presumed autistic individuals without intellectual disabilities. Suicide attempts and behaviors were observed in 24.3% of this population, significantly higher than the general population, in which transnational estimates place suicidal ideation at approximately 9%, with 2–3% reporting suicide plans or attempts.

A separate meta-analysis published in 2022 by O'Halloran et al. found that about one-quarter of all autistic individuals experience suicidal ideation and approximately one in ten have attempted suicide during their lifetime.

The prevalence of suicidal ideation varies by region. Reported rates are lower in several Asian countries, including South Korea, Taiwan, China, Singapore, and Japan, compared to Europe and Oceania. This lower prevalence may not reflect actual trends. It could be influenced by factors such as legal penalties for suicide, cultural emphasis on family honor, and greater stigma surrounding autism and mental health.

Gender ratio

A 2014 systematic review by Segers and Rawana initially found higher suicide rates among autistic men compared to women. However, subsequent cohort studies conducted in Denmark, Sweden, Ontario (Canada), and Utah (United States) reported that suicidal ideation and suicide attempt rates are consistently higher among autistic women and girls than among their male counterparts. This trend contrasts with patterns observed in the general population, where men typically exhibit higher rates of suicide completion than women.

A 2023 systematic review identified autistic women without intellectual disabilities as a population at particularly high risk. However, it found limited confirmation of earlier findings suggesting that suicidality is more frequent among autistic women. Most of the studies included in this review had a majority of female participants. The elevated suicide risk in this population may be linked to challenges in diagnosis, often resulting in delayed or missed identification of autism in women.

In the Danish cohort, suicide rates were higher than in the general population across all age groups beginning at age 10. The highest suicide rate was recorded among individuals aged 30 to 39.

The 2023 meta-analysis noted a lack of comprehensive research on suicide rates by age group but suggested that rates tend to be higher among adults than among youth, especially from age 20 onward. These rates remain elevated in older adults, who exhibit suicidal ideation at rates five to six times higher than in the general population.

Methods of suicide

According to data from the Utah cohort, autistic individuals are less likely than non-autistic individuals to die by firearm-related suicide but show no significant differences in the overall selection of suicide methods. There is also no notable distinction between men and women in the techniques used. Approximately 73% of suicides involve violent means. Non-violent methods typically include asphyxiation and poisoning.

In a Finnish cohort study of autistic individuals with moderate to severe intellectual disabilities, recorded suicide methods included hanging, drowning, poisoning (via a laced cigarette or medication ingestion), and suicide by train—either by lying on the tracks or jumping in front of a moving train.

Limitations of research

Most studies on suicide and autism are conducted in high-income countries, even though global suicide rates tend to be higher in low- and middle-income regions. Additionally, there is a notable lack of research focused on autistic individuals with intellectual disabilities. Another methodological limitation concerns the frequent failure to distinguish between passive suicidal ideation (a wish to be dead) and active suicidal ideation (an intention to end one's life), which may affect the accuracy of reported prevalence rates.

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