Suicide and self-harm

Autistic people die by suicide more often than other people. In a Swedish register study of 27,122 diagnosed autistic people, 0.31% died by suicide (including deaths of uncertain intent) against 0.04% of matched controls, about 7.5 times the odds.¹ In Denmark, autistic people had about 3.2 times the rate of suicide attempts and 3.75 times the rate of suicide.² A 2024 meta-analysis of 10 studies, covering about 10.4 million people, put the risk at about 2.85 times that of non-autistic people, and estimated about 13,400 excess suicide deaths worldwide in 2021; its authors note the studies were few and covered few countries.³

Whole-population data from Manitoba, Canada, found that among 13- to 45-year-olds, 0.69% of autistic people had attempted suicide against 0.22% of others, about three times as likely once age and sex were taken into account; the rate was higher in females than in males, on small numbers.⁴ Adjusting also for mood and anxiety disorders and ADHD reduced the figure to about twice as likely.⁴ A national health-records study of 2.3 million people with autism found a recorded suicide attempt in 1.7%, higher in females than males, peaking between 15 and 24 overall and later in males, and far higher again in those who also had another psychiatric diagnosis.⁵

In the Swedish study, the excess was concentrated in autistic people without a recorded intellectual disability: the odds were 9.4 times those of controls for this group and 2.4 times for those with one, a figure based on only 7 deaths.¹ Relative to people of the same sex, the increase was larger in autistic women than in autistic men.^1,3 A 2024 commentary notes that this does not mean autistic women die by suicide more often than autistic men: population data show similar suicide death rates, while findings on other suicidal behavior are mixed.⁶ In Denmark, autistic women had about 4.4 times the rate of suicide attempts of autistic men, against about 1.4 times among non-autistic people.²

Most autistic people who attempted or died by suicide also had another psychiatric diagnosis: about 92% and 91% in Denmark.² Autism without another diagnosis went with a small, statistically uncertain rise in suicide attempts, compared with people who had no psychiatric diagnosis.² In Sweden, risk was highest in autistic people without intellectual disability who also had ADHD; taking other psychiatric diagnoses into account weakened the link, and relatives of autistic people also had raised risk.⁷

A study of coroners' records in two regions of England found signs of diagnosed or possible autism in 10.8% of people who died by suicide, about ten times the 1.1% expected; the expected estimate likewise includes undiagnosed cases, and the signs of autism came from records and screening rather than a full diagnostic assessment.⁸ Register figures describe diagnosed people, who may not represent autistic people overall: one UK study estimated that about nine in ten autistic people may have gone undiagnosed during the period its records covered.⁹

Thoughts of suicide are common among autistic people. Pooling 36 studies of autistic and possibly autistic people without intellectual disability, 34.2% had had suicidal thoughts, 21.9% had made plans and 24.3% had made an attempt or other suicidal act.¹⁰ Figures varied widely between studies; their geography, whether the sample was transgender or gender-non-conforming, and how they measured suicidal thoughts went with the differences.

Of 367 respondents among 374 adults newly diagnosed with Asperger syndrome at a UK clinic, 66% reported having had suicidal thoughts at some time, nearly ten times the odds in a separate general-population survey, and 35% had made plans or attempts.¹¹ In the Netherlands Autism Register, 80% of 1,164 adults, a self-selected sample, answered yes to a single screening question about lifetime suicidal thoughts or attempts.¹²

In midlife and older age, the pattern holds. In a UK study of 388 adults aged 40 to 93, 222 of them autistic, the autistic group reported more suicidal thoughts, more thoughts of self-harm and more self-harm than a non-autistic comparison group; among the autistic participants, women reported more suicidal thoughts and more suicidal self-harm than men, and the oldest reported more thoughts of self-harm and more self-harm than those in midlife.¹³ A 2026 review of 19 studies lists psychiatric conditions, bullying and cognitive factors among the risks for suicidal behavior in autistic people; it found few protective factors studied, with social relationships the main one the studies identified.¹⁴

Autistic people self-harm much more often than non-autistic people. A meta-analysis of 31 studies found that autistic children and adults had about three times the odds of self-injurious behavior (pooled odds ratio 3.18, 95% confidence interval 2.45 to 4.12) and about three times the odds of suicidality (3.32, 2.60 to 4.24; the self-injury category does not separate non-suicidal self-injury from the self-injury that forms part of repetitive behaviors); the results held across clinic and community samples and across age groups.¹⁵ In the Stockholm Youth Cohort, of 410,732 young people, autistic youth were about five times as likely to have self-harm recorded at a hospital, and the increase was larger without intellectual disability; it was not explained by factors shared within families, and the methods used were potentially more lethal.¹⁶ In Ontario, autistic people had more self-harm events than non-autistic people even after psychiatric diagnoses were taken into account.¹⁷

The patterns come from smaller samples. In a study of 520 autistic adolescents and adults, half of them with recent non-suicidal self-injury, that group had lower self-compassion, more depression and anxiety, more autistic traits, greater difficulty naming their emotions, and more camouflaging than the matched group without it; they were also over four, five and three times more likely to have had passive suicidal thoughts, active suicidal thoughts and suicide attempts.¹⁸ In this sample, hitting and banging were more common than cutting, and the average age at first self-injury was about 10.¹⁸ A review of 16 studies put the share of autistic people who self-injure without wanting to die at between 24% and 50%, and notes that this behavior is often confused with the self-injury that forms part of restricted and repetitive behaviors.¹⁹

Autistic adults describe self-harm as a way of managing feelings and sensory states. In an online survey of 103 autistic adults without intellectual disability, the most common purpose was to regulate low-energy states such as depression or dissociation, and difficulty naming emotions went with self-harm and with using it to communicate distress.²⁰ In an online qualitative study that analyzed autistic adults' own accounts, participants described self-harm as a way of coping with anxiety and depression and of relieving a buildup of sensory or mental overload that can otherwise lead to a meltdown; repetitive movements such as stimming, and meltdowns, can themselves be self-harming when they cause tissue damage, and many said help was hard to get.²³ In a further cross-sectional study of autistic and non-autistic adults, more frequent self-injury went with more numerous lifetime suicide attempts, and a reduced fear of death and mental rehearsal of suicide accounted for part of the link; the design cannot show the direction.²¹ In another study of 150 autistic and 189 non-autistic adults, 63% of the autistic group scored above the cutoff for high suicide risk, and among those with many autistic traits the risk rose with difficulty naming emotions.²²

Standard questionnaires often misread autistic people. Autistic adults understood two items of a common suicide questionnaire, the SBQ-R, differently from how its designers intended: one on communicating intent, and one on the likelihood of a future attempt.²⁴ An adapted version for suicidal behavior, built with autistic-adult feedback, is validated for research use in adults without intellectual disability (largely female, largely diagnosed in adulthood); it is not designed to predict who will attempt suicide or to compare autistic and non-autistic people.²⁵ Similar problems appear with other tools: the PHQ-9 question about suicidality measured different things in autistic and non-autistic college students,²⁶ and in one study, nearly one in five autistic adolescents said on a self-report form that they had had suicidal thoughts but did not say so to the psychiatrist.²⁷

Self-harm tools are less tested still. A review of 8 self-harm questionnaires found that only two, the ISAS and the QNSSI, had sufficient evidence of internal consistency, and that only one, the NSSI-AT, had been used often with autistic adults; even these three needed more work on whether they capture what matters to autistic people.²⁸ In focus groups, autistic adults and professionals described the available tools as "the best of a bad bunch".²⁹ As of October 2026, no purpose-built measure of self-harm, with or without suicidal intent, had been validated for autistic people, and autistic people in one study struggled to fit their experience into the fixed answer options of a standard self-harm interview.³⁰ A 2020 review found no suicidality tool commonly used with autistic children and youth.³¹

A safety plan is a common way to help someone through a suicidal crisis. A UK team adapted the format for autistic adults with focus groups of autistic adults, family members and providers, then tested the result. In a pilot randomized trial of 49 adults, the adapted plans were feasible, 68% of participants were satisfied and 41% rated them usable, and most stayed in the study, but the trial was too small to show whether they reduce suicidal behavior.³² A 2026 scoping review of 27 studies found few randomized trials of any approach to reducing suicidality in autistic people, and called the field nascent.³³

People also describe barriers to getting help at all. In a survey of 754 autistic adults in the UK who did not seek public health care the last time they felt suicidal, the most common reasons were trying to cope alone, not thinking services could help, and long waiting lists; the study had no comparison group.³⁴ In an earlier survey of 200 autistic adults, difficulty getting treatment, clinicians who did not understand autism alongside mental-health problems, and a link between poor support and "seeing suicide as their future" were the main themes.³⁵

Autistic writers often describe self-harm and suicidal thoughts as responses to a life that does not fit them. Sol Smith writes that some autistic people consider ending things "as the solution to a sort of thought puzzle", a way of feeling they choose to endure; Smith still urges readers to "always seek professional help if you're feeling any impulse toward self-harm", and to "Keep choosing to be here."^c1 Megan Anna Neff writes that self-harm "can manifest as a coping response for many Autistic people", often from overwhelming sensory experiences, intense emotions, a need for sensory input, or "an urge to punish ourselves", and that it "is a serious matter" that may need professional support.^c2

Some writers tie suicidal feelings to masking. Morénike Giwa Onaiwu, in a poem about a girl who is not diagnosed until adulthood, writes of "a growing yearning for suicide / As a possible antidote to the pain".^c3 A participant in the #TakeTheMaskOff campaign, quoted in Amy Pearson and Kieran Rose's book, says: "I've been suicidal many times in my life and most times it's because I simply cannot cope with the way the world works".^c4 Devon Price lists self-injury and other "problematic coping strategies" among what masked autistic people fall back on.^c5

Getting help in a crisis can be hard for practical reasons. Carly Jones reports a 2016 survey in which "78 per cent of Autistic people asked felt they were unable to use a phone to make a call in a time of crisis".^c6