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Research · for Autism charities & autistic-led organisations

The Autism Health Gap: Greater Health Needs, Shorter Lives

Published 2026-09-22

About 1 in 127 people worldwide are autistic. Across countries and study designs, the research points the same way: autistic people are more likely to live with epilepsy, mental health conditions and other health needs, are often diagnosed years after someone first raised a concern, and on average die younger than the people around them.

Behind those findings are ordinary lives. It is the child whose seizures, stomach pain or sleepless nights are put down to “just the autism” instead of being looked into. It is the teenager whose anxiety builds for years before anyone names it. It is the adult who reaches middle age without a diagnosis, meeting each crisis without an explanation. The figures here come from registries, censuses and meta-analyses across Europe, North America, Asia and beyond. They say nothing about the worth of autistic lives, and a great deal about how well health systems are meeting autistic people’s needs.

1 in 127people worldwide were autistic in 2021, an estimated 61.8 million people[1][2]
2.37×the all-cause mortality of the general population, pooled across 12 studies with 154,238 participants (relative risk)[3]

Autism is found everywhere, but recognition is uneven

The World Health Organization puts the figure at about 1 in 127 people in 2021[2], matching the Global Burden of Disease (GBD) 2021 study, which estimated 61.8 million autistic people worldwide, an age-standardised prevalence of 788.3 per 100,000[1]. A systematic review of 99 estimates from 71 studies in 34 countries, published between 2012 and 2021, reached a similar figure: a median of 100 per 10,000, or about 1%[4].

GBD’s modelled estimates run from 669.2 per 100,000 in southeast Asia, east Asia and Oceania to 1,090.2 in high-income countries[1]. Individual studies vary far more, from 1.09 to 436 per 10,000, which the review says likely reflects differences in community awareness, service capacity, help-seeking and the populations studied[4]. In the US, the CDC’s Autism and Developmental Disabilities Monitoring (ADDM) Network counts children with an autism diagnosis, special education eligibility for autism or an autism diagnostic code in their records. Across its 16 sites it identified autism in 1 in 31 eight-year-olds in 2022 (32.2 per 1,000), ranging from 9.7 per 1,000 in Laredo, Texas, to 53.1 in California[5]. That is the most recent ADDM report at the time of writing.

Estimated autism prevalence by world region, 2021Global Burden of Disease 2021 age-standardised estimates of autistic people per 100,000: high-income 1,090.2; central Europe, eastern Europe and central Asia 927.5; sub-Saharan Africa 890.2; global 788.3; north Africa and Middle East 771.8; Latin America and Caribbean 689.5; south Asia 686.2; southeast Asia, east Asia and Oceania 669.2.03006009001200High-income countries1,090.2Central Europe, easternEurope & central Asia927.5Sub-Saharan Africa890.2Global788.3North Africa & Middle East771.8Latin America & Caribbean689.5South Asia686.2Southeast Asia, east Asia& Oceania669.2
Estimated autistic people per 100,000, age-standardised, by GBD super-region, 2021. These are modelled estimates with wide uncertainty intervals (global: 663.8–927.2), not counts of diagnoses. Source: GBD 2021 Autism Spectrum Collaborators, The Lancet Psychiatry 2025, Table 2, via Europe PMC.

Rising numbers are often read as a rise in autism itself. The prevailing explanation in the research is different. The international review attributes the increase in measured prevalence to “multiple factors including the increase in community awareness and public health response globally, progress in case identification and definition, and an increase in community capacity”[4]. The CDC notes that differences over time and between sites can reflect “differing practices in ASD evaluation and identification” and access to services[5]. GBD’s own jump from 1 in 271 in its 2019 round to 1 in 127 is attributed mainly to a change in its methods[1]. The figures above are not directly comparable and do not show a trend.

Autism is identified more often in boys and men: 3.4 times as often in boys as in girls among US eight-year-olds[5], while GBD estimates 1,064.7 autistic males per 100,000 against 508.1 females[1]. How much of that gap reflects missed diagnoses in girls and women is still debated. A meta-analysis found a male-to-female ratio of 4.20 overall but 3.32 in higher-quality studies, and concluded that girls who meet the criteria “are at disproportionate risk of not receiving a clinical diagnosis”[6]. We look at this in autistic women and girls and diagnosis.

Diagnosis often comes years after the first concern

A global meta-analysis put the average age at diagnosis at about five years[7]. A review comparing countries by income level found an average delay of more than two and a half years between first concerns and diagnosis, with no statistically significant difference between low-, middle- and high-income countries[8]. For adults the gap can last most of a lifetime. In England’s primary-care records for 2018, 2.94% of 10–14-year-olds had an autism diagnosis, against 0.02% of people aged 70 and over. The authors’ exploratory projections suggest that between 435,700 and 1,197,300 people in England may be autistic and undiagnosed[9].

WhereWhat was measuredFinding
Global meta-analysis (studies 2012–2019)Mean age at diagnosis60.48 months; 43.18 months in studies of children aged 10 or under[7]
Countries at all income levels (review)First concerns → diagnosis23.64 → 55.97 months; average delay 32.33 months[8]
United States (8-year-olds, 2022)Median age at earliest known diagnosis47 months; from 36 (California) to 69.5 (Laredo, Texas)[5]
England (primary care, 2018)Newly recorded diagnosesAbout 1 in 250 5–9-year-olds, vs about 1 in 4,000 aged 20–49 and 1 in 18,000 aged 50+[9]

These studies use different designs, ages and data sources, so the rows are not directly comparable. More in age at diagnosis around the world.

Co-occurring health conditions are common and deserve care in their own right

The WHO notes that autistic people “often have co-occurring conditions, including epilepsy, depression, anxiety and attention deficit hyperactivity disorder”[2]. These are health needs in their own right, and they are common.

  • Intellectual disability. In the international review, a median of 33.0% of autistic people in prevalence studies also had an intellectual disability[4]; among US eight-year-olds with cognitive test data the figure was 39.6%[5]. People with both often face the widest health gaps, as the mortality evidence below shows.
  • Epilepsy. About 1 in 10 autistic people also has epilepsy, according to a meta-analysis that found higher rates in adults than in children, and in study samples with more women or more people with intellectual disability[10]. A separate systematic review found a median period prevalence of 12.1%[11]. WHO estimates that 4 to 10 per 1,000 people in the general population have active epilepsy (continuing seizures or needing treatment) at a given time[12]. Those are different measures, so the ratio between them should not be read precisely, but the gap is wide. See epilepsy and autism.
  • Wider health. Scotland’s 2011 Census, which covered 94% of the population, allows a like-for-like comparison. Among adults aged 25 and over, 33.0% of those reported as autistic also reported a mental health condition, against 5.7% of other adults. For physical disability the figures were 24.0% against 9.1%, and for blindness or partial sight loss 12.1% against 3.1%[13].
  • The gut. A meta-analysis of questionnaire-based studies found that 55% of autistic children and adolescents had at least one gastrointestinal symptom, most often constipation (37%). Their odds of GI symptoms were 3.64 times those of non-autistic (typically developing) children[14]. See gut health and autism.
  • Sleep. A 2026 meta-analysis of 22 studies (3,771 participants) put the prevalence of sleep disorders among autistic children and adolescents at 60%[15], while diagnosed sleep-wake disorders were found in 13% of autistic people in a large meta-analysis of clinical diagnoses[16]. How sleep is measured changes the answer a great deal. See sleep and autism.
Health conditions among autistic and non-autistic peopleScotland's Census 2011, adults aged 25 and over, autistic vs non-autistic: mental health condition 33.0% vs 5.7%; physical disability 24.0% vs 9.1%; deafness or partial hearing loss 14.1% vs 9.1%; blindness or partial sight loss 12.1% vs 3.1%. Epilepsy (different measures, not like-for-like): median period prevalence 12.1% among autistic people vs 0.4 to 1% of the general population with active epilepsy.Autistic peopleNon-autistic people / general population0%10%20%30%40%Mental health condition(Scotland, 25+)33.0%5.7%Physical disability(Scotland, 25+)24.0%9.1%Deafness or hearing loss(Scotland, 25+)14.1%9.1%Blindness or sight loss(Scotland, 25+)12.1%3.1%Epilepsy: any vs active(not like-for-like)12.1% (any)0.4-1% (active)
Top four rows: autistic and non-autistic adults aged 25 and over (autism as reported in the census), Scotland’s Census 2011 (Rydzewska et al., BMJ Open 2018, Europe PMC). The epilepsy row is not like-for-like: median period prevalence of any epilepsy among autistic people (Lukmanji et al. 2019, Europe PMC) against WHO’s estimate that 4–10 per 1,000 people have active epilepsy (WHO); the pale bar is drawn at the top of that range.

Mental health needs are common at every age

A meta-analysis pooling 96 studies found that 28% of autistic people had ADHD, 20% an anxiety disorder and 11% a depressive disorder[16]. A separate meta-analysis of autistic adults found higher figures: 27% had a current anxiety disorder and 42% had had one at some point in their lives; for depression the figures were 23% current and 37% lifetime[17]. These are among the most common health needs in the autistic community, and they deserve timely care adapted to autistic people. See anxiety and depression in autistic people.

Co-occurring mental health diagnoses in autistic peoplePooled prevalence among autistic people from a meta-analysis of 96 studies: ADHD 28%; anxiety disorders 20%; sleep-wake disorders 13%; disruptive, impulse-control and conduct disorders 12%; depressive disorders 11%; obsessive-compulsive disorder 9%; bipolar disorders 5%; schizophrenia spectrum disorders 4%.0%10%20%30%40%ADHD28%Anxiety disorders20%Sleep-wake disorders13%Disruptive & conductdisorders12%Depressive disorders11%Obsessive-compulsivedisorder9%Bipolar disorders5%Schizophrenia spectrumdisorders4%
Pooled prevalence of diagnosed co-occurring conditions among autistic people of all ages, meta-analysis of 96 studies. Source: Lai et al., The Lancet Psychiatry 2019, via Europe PMC.

Mental health is also closely linked to suicide risk. A meta-analysis of studies of autistic young people found that about one in four (25.2%) had experienced suicidal thoughts and 8.3% had made a suicide attempt. Adverse childhood experiences were a strong risk factor, and resilience was protective[18]. In Denmark’s national registers, covering 6.6 million people aged 10 and over, autistic people had 3.19 times the rate of suicide attempts and 3.75 times the rate of death by suicide of non-autistic people, after adjustment[19]. That raised risk was concentrated among people who also had other diagnoses. Compared with people with no psychiatric diagnosis, autistic people with other diagnoses had 9.27 times the rate of suicide attempts, while for those with an autism diagnosis only the difference was small and not statistically clear (1.33; 95% CI 0.99–1.78). More than 90% of autistic people who attempted or died by suicide had another diagnosed condition[19]. None of this is a forecast for any individual. The findings point to mental health conditions that can be recognised and supported, and help is available, including the helplines below. More in suicide and autism: what the research shows.

If you need support right now In the UK and Ireland, Samaritans are free to call on 116 123, day or night. In the US, call or text 988. Elsewhere, findahelpline.com lists free, confidential helplines by country. If a life is at immediate risk, call your local emergency number.

Autistic people die younger on average, across health systems

A 2022 meta-analysis in JAMA Pediatrics pooled 12 studies (154,238 participants) and found all-cause mortality among autistic people 2.37 times that of the general population (relative risk; 95% CI 1.97–2.85)[3]. Deaths from natural causes (RR 3.80) and from unnatural causes (RR 2.50) were both raised. The gap was wider for autistic women and girls (RR 4.87) than for men and boys (RR 2.09), though results varied a great deal between studies and the authors rated these cause- and sex-specific estimates as low confidence[3]. National data from several countries tell the same story:

  • Sweden: of 27,122 autistic people diagnosed between 1987 and 2009, 2.60% died during follow-up, against 0.91% of 2.67 million matched controls (odds ratio 2.56)[20].
  • Taiwan: 64,685 autistic people followed from 2008 to 2019 had a hazard of death 2.28 times that of 1,279,174 age- and sex-matched non-autistic people. The raised risk was higher for autistic women than for autistic men, for adults than for younger people, and for people with a co-occurring intellectual disability than for those without[21].
  • United States: among more than 2 million autistic Medicaid beneficiaries (2000–2020), life expectancy at birth was 64.9 years. That is 5.6 years shorter than for all Medicaid beneficiaries and 13.8 years shorter than for the US general population. Compared with the US female and male populations, the gap was 16.0 years for autistic women and 11.6 years for autistic men[22].
Life expectancy at birth: autistic Medicaid beneficiaries vs comparison groups, United StatesLife expectancy at birth, United States, 2000 to 2020: autistic Medicaid beneficiaries 64.9 years; all Medicaid beneficiaries about 70.5 years; US general population about 78.7 years.020406080Autistic Medicaidbeneficiaries64.9 yearsAll Medicaid beneficiaries~70.5 yearsUS general population~78.7 years
Life expectancy at birth, US Medicaid data 2000–2020. The study reports 64.9 years for autistic beneficiaries and gaps of 5.6 and 13.8 years; the two comparison bars are those gaps added to 64.9. Source: Li et al., JAMA Network Open 2026, jamanetwork.com.

Much of this excess looks preventable. In the Medicaid data, excess mortality was most pronounced for influenza (standardised mortality ratio 10.55), malnutrition (7.56), pneumonitis caused by inhaled food or liquid (6.92), non-transport accidents (4.48), drowning (3.26) and pneumonia (3.06). The authors call for “targeted interventions to reduce preventable excess mortality”[22]. The gaps continue into later life. In US Medicare data, 4,685 autistic older adults had 18.9 times the odds of epilepsy and 6.1 times the odds of Parkinson’s disease compared with 46,850 matched older adults[23]. See the mortality gap and growing older autistic.

Vaccines do not cause autism: the evidence covers millions of children

The answer from large studies has not changed. A meta-analysis of five cohort studies covering 1,256,407 children found no association between vaccination and autism (odds ratio 0.99; 95% CI 0.92–1.06)[24]. A Danish study of 657,461 children born from 1999 to 2010 found no increased risk after the MMR vaccine (hazard ratio 0.93; 95% CI 0.85–1.02), including in subgroups such as children with autistic siblings[25]. In December 2025, WHO’s Global Advisory Committee on Vaccine Safety reviewed 31 studies published between January 2010 and August 2025 and reaffirmed that vaccines, “including those with thiomersal and/or aluminum, do not cause autism”[26].

Attention spent on a disproven cause is attention not spent on the health needs above. More in vaccines and autism: what every major study found.

What the evidence asks of us

The sources themselves point to where services, funders and governments can start:

  • Make healthcare work for autistic people. WHO reports that autistic people “have higher rates of unmet health-care needs compared with the general population”, and that a common barrier is “health-care providers’ inadequate knowledge and understanding of autism”[2]. England’s Health and Care Act 2022 made learning disability and autism training a legal requirement for staff of CQC-registered providers[27].
  • Recognise autism earlier, at every age. GBD’s authors say the findings “underscore the importance of early detection and support to autistic young people and their caregivers globally”[1]. For adults, the English primary-care study found “an urgent need to improve access to adult autism diagnostic services”[9]. Our analysis of England’s assessment backlog shows how far there is to go.
  • Build mental health support and suicide prevention around autistic people. The Danish study concluded that its findings suggest “the need for tailored suicide prevention strategies”[19].
  • Target preventable deaths. Taiwan’s researchers call on health policy to prioritise early detection of disease and health promotion, as well as accident and suicide prevention, which they single out for autistic women and people without intellectual disability[21]. The US Medicaid findings on influenza, pneumonia and drowning point in the same direction[22].
  • Fund support, and count its cost honestly. A 2014 study estimated the lifetime cost of support for an autistic person in the UK at £1.5 million with an intellectual disability and £0.92 million without; in the US, $2.4 million and $1.4 million. The largest items were not medical: special education and parents’ lost productivity in childhood, and residential care or supported living and the person’s own lost productivity in adulthood[28]. They show where support is needed; they are not a price on autistic people. See the cost of support.

For the full set of articles in this library, see Autism & Health research.

Language: this piece uses identity-first language (“autistic people”), the preference of most autistic-led organisations, and uses clinical terms such as “autism spectrum disorder” or “ASD” only when naming a study or diagnostic category.

Why we're publishing this

Health Insurance UK is a commercial health-insurance resource, not a charity and not a campaign. We built this overview because autistic people, their families and the autistic-led organisations campaigning for better care deserve the international evidence clean, checked and in one place, ready to put in front of a commissioner, a minister, a funder or a journalist. The case is theirs, not ours. Our part is to say plainly what the research shows: autistic people have more health needs, are often recognised late, and on average die younger than they should.

How to read this data

This summarises published research. The studies measure different things. Prevalence may be diagnosed, record-based or modelled; co-occurring conditions may be self-reported, parent-reported or clinically diagnosed. Mortality results are relative risks, odds ratios, hazard ratios or standardised mortality ratios, which are related but not interchangeable. We keep each figure attached to its population and comparison group, and do not present figures from different studies as a trend. Much of the evidence comes from the US, the Nordic countries, the UK and Taiwan; far less comes from low- and middle-income countries. Associations do not show cause and effect. Where we could see only an abstract, we used only what the abstract says.

Use this data

Free to cite with attribution to Health Insurance UK. Charities, campaigners and journalists are welcome to reuse these figures and charts. For the underlying figures as a spreadsheet, get in touch.

Suggested citation: Health Insurance UK (2026). The Autism Health Gap: Greater Health Needs, Shorter Lives. https://www.healthinsuranceuk.net/research/autism-health-global-evidence

Important: This article summarises published research for general information. It is not medical advice and cannot be used to diagnose, treat or predict anything about an individual. If you have concerns about your own or someone else’s health, please speak to a qualified health professional.

Sources

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  6. Loomes R, Hull L, Mandy WPL. What is the male-to-female ratio in autism spectrum disorder? A systematic review and meta-analysis. Journal of the American Academy of Child and Adolescent Psychiatry, 2017. europepmc.org/article/MED/28545751
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