Autism and Learning Disability: About One in Three, and the Widest Health Gaps

Around a third of autistic people also have a learning disability, the term UK health services use for what most of the world calls an intellectual disability. People who are autistic and have a learning disability face some of the widest health gaps on record: more long-term conditions, care that too often fails to adapt to them, and deaths that come early and, far too often, did not have to happen.

In ordinary life, this is a run of small failures that add up. It is the person who cannot easily say where it hurts, whose pain shows up as distress and is written off as part of their autism or their learning disability. It is the ten-minute appointment that needed thirty, the letter nobody made readable, and the family member or support worker who has to push, every time, for adjustments the person is already entitled to. None of this is written into anyone's biology. The data below show how large the gap is and, just as clearly, where it can be closed.

About a third of autistic people also have an intellectual disability

First, the words. Mencap defines a learning disability as “a reduced intellectual ability, usually identified soon after birth or in the early years”, which lasts a person's whole life. It is not the same as a learning difficulty such as dyslexia, which does not affect intellectual ability^[4]. A learning disability ranges from mild to profound^[3]. Most research outside the UK calls the same thing an intellectual disability, and Scottish researchers note that the two terms are used synonymously^[5]. Autism is not itself a learning disability, but the two often come together.

A 2022 global review of prevalence studies published between 2012 and 2021 found a median of 33.0% of autistic people had an intellectual disability, with estimates ranging from 0% to 70%. For many world regions there were few or no estimates at all^[1]. A three-level meta-analysis of studies from 1994 to 2019 found a mean of 34.9%. Definitions matter: the mean was 60.0% among people diagnosed with “autistic disorder” and 3.4% among those diagnosed with Asperger syndrome^[6].

National figures sit across that range. In the United States, the CDC's Autism and Developmental Disabilities Monitoring (ADDM) Network found that 39.6% of autistic 8-year-olds with cognitive data in 2022 had an intellectual disability, defined as an IQ of 70 or below or an examiner's statement^[7]. In Scotland's 2011 Census, 29.4% of adults aged 25 and over reported to be autistic also had an intellectual disability^[8]; across all ages the figure was 18.0%^[5]. In UK GP records for 1989–2019, 6,450 of 23,580 adults with a recorded autism diagnosis also had a recorded intellectual disability, about 27% by our calculation^[9], and in Taiwan's national insurance data for 2008–2019, 14,461 of 64,685 autistic people did, about 22%; four in five of that cohort were children under 15^[10].

The share fell, most likely because more autistic people without an intellectual disability were recognised

ADDM reported that the share of autistic children with an intellectual disability fell from 47% in 2002 to 41% in 2006 and 31% in 2010, while the share with average or above-average intellectual ability rose from 32% to 46%^[11]. It stayed at 31% in 2014^[12], then rose again: 35.2% in 2018^[13], 37.9% in 2020^[14] and 39.6% in 2022^[7]. The US government's report to Congress on autism put the figure for 2000 at an estimated 40–62%, and said the decrease was “likely due to the increase in diagnosis of autism in children with average to above average cognitive function”^[15]. That is the prevailing explanation, not a settled fact, and ADDM sites changed between reports, so the series is indicative only.

A falling share never meant fewer autistic people with an intellectual disability. In seven ADDM sites with comparable data, the estimated prevalence of autism with intellectual disability rose by 45% on average between 2002 and 2008, from 3.2 to 4.6 per 1,000 children^[16].

Who is identified is also unequal. In 2022, 52.8% of Black autistic 8-year-olds in ADDM had an intellectual disability, against 32.7% of White autistic children; girls and boys were similar (40.4% and 39.5%)^[7]. The report to Congress said such differences “could relate in part to access to services that diagnose and support children with ASD”^[15]. If so, some Black autistic children without an intellectual disability may be going unidentified.

In England's GP data, which cover about 55% of registered patients, the share of patients with a learning disability who also had an autism diagnosis rose every year, from 21.4% in 2017–18 to 35.3% in 2024–25^[2]. That is usually read as better recognition rather than more autism, though the statistics alone cannot say which. Either way, an autism diagnosis that is never recorded cannot shape how someone's care is adapted.

People who are autistic and have an intellectual disability report far more health conditions

The fullest picture comes from Scotland, where about 94% of the population answered the 2011 Census, including questions on long-term conditions^[5]. Researchers identified 5,709 people who were autistic and had an intellectual disability, 1.08 per 1,000 of the population. Their general health was substantially poorer than everyone else's, most of all in childhood: adjusted for age and gender, they had 48.8 times the odds of reporting poor general health^[17].

Among adults aged 16 to 64, 39.5% of this group reported a physical disability and 36.9% a mental health condition, against 4.7% and 5.4% of other adults. Sight and hearing loss were far more common too. The authors describe a “more than double disadvantage”, with gaps larger than those previously reported for people with either condition alone^[5].

Each condition matters in its own right. A companion analysis found that intellectual disability more strongly predicted poor general health and autism more strongly predicted mental health conditions; autism on its own was “independently associated with substantial health inequalities”^[18]. Sensory loss deserves particular attention because, as the Scottish researchers point out, it compounds existing communication and cognitive differences and makes assessment harder^[5].

Epilepsy is one of the clearest examples. A meta-analysis found epilepsy in 21.5% of autistic people with an intellectual disability, against 8% of those without^[19]. Our article on epilepsy in autistic people covers this in detail.

Deaths come early, and many could have been avoided

England's Learning from Lives and Deaths programme (LeDeR) reviews the deaths of people with a learning disability and autistic people. Its latest report, on deaths in 2024, found a median age at death of 62.8 years for adults with a learning disability, against 81.8 for the general population. The median was 64.9 years for people with a mild learning disability and 40.7 years for those with a profound learning disability. Of deaths with a known cause, 39.0% were avoidable, against 21.1% in the general adult population, and 25.0% were from treatable causes, against 7.6%. Pneumonia and epilepsy were among the leading avoidable causes. The avoidable share has fallen from 46.3% in 2021, which shows it can move^[3].

LeDeR's learning disability figures cover everyone with a learning disability, autistic or not, and its separate autism chapter covers only autistic adults without one^[3]. So LeDeR gives no separate mortality figures for autistic people who also have a learning disability. For the wider picture, see our study Dying Younger: the health inequality facing people with a learning disability.

Scotland shows a similar pattern. Among 14,477 adults aged 25 and over with an intellectual disability (with or without autism), identified in the 2011 Census and followed to 2019, the median age at death was 65.0 years, against 80.0 for other adults, and 31.7% of deaths were avoidable, against 18.2%^[20].

Studies following autistic people find mortality raised with and without an intellectual disability, and highest with one.

Each study uses a different measure, period, population and comparison group. Compare within rows, not between them.

The causes point to health needs that can be treated. In Sweden, autistic people with an intellectual disability had 40.6 times the odds of dying from a disease of the nervous system, and 13.9 times the odds of dying from a respiratory disease, compared with matched controls^[21]. In Taiwan, autistic people with an intellectual disability had adjusted hazard ratios of 12.15 for neurological and 6.61 for respiratory deaths, again against non-autistic controls^[10]. In the UK cohort, estimated life expectancy was 7.28 years shorter for autistic men with an intellectual disability and 14.59 years shorter for autistic women with one, though the authors caution that few autistic adults have been diagnosed^[9]. Our article on autism, mortality and life expectancy sets out the wider evidence.

Much of the gap lies in how care is delivered

“Diagnostic overshadowing” is what happens when a new symptom is put down to someone's autism or learning disability instead of being investigated: pain read as behaviour, a change in someone's usual self put down to “how they are”. LeDeR links the higher share of treatable deaths among people with a severe or profound learning disability to “challenges in recognising deterioration, communication barriers, diagnostic overshadowing, or delays in escalation of care”^[3]. Worldwide, the WHO lists “a lack of knowledge, negative attitudes and discriminatory practices among healthcare workers” among the causes of disabled people's poorer health, and notes that some die up to 20 years earlier than people without disabilities^[22].

The reviews show where care goes wrong. In focused LeDeR reviews of adults with a learning disability who died in 2024, 22.2% had needed at least one reasonable adjustment that was not provided, down from 34.0% in 2021, and 39.8% of those who died in 2024 experienced a delay in care or treatment. Reviewers found “systemic problems rather than isolated errors”, including poor communication, incomplete documentation and a lack of coordinated care planning^[3].

England's main preventive programme for people with a learning disability is the annual health check. Anyone aged 14 or over on their GP's learning disability register can have one, covering a physical check-up, screening for conditions such as epilepsy and swallowing problems, and a medicines review^[23]. In 2025–26, 273,430 checks were completed, for 79.8% of people aged 14 and over on the register^[24], almost unchanged from 79.9% the year before^[25]. Evidence from the scheme's first three years is encouraging: practices in the incentivised scheme carried out far more checks, such as hearing assessments, than practices outside it, and identified more thyroid disorder and obesity^[26].

The gap that remains is for autistic people. Autistic people without a learning disability do not currently get a health check^[27]; in September 2025, NHS England said it was trialling an autism-specific check, and a combined check, in two integrated care board areas^[25]. Autistic people with a learning disability are eligible only if they are on the register, and a check is only as good as the adjustments that let someone take part. Our article on barriers to healthcare for autistic adults covers these obstacles in more depth.

What the evidence asks of us

This health gap is large, well documented and, in part, avoidable. The evidence points to six things:

• Treat equal care as a right. The UN Convention on the Rights of Persons with Disabilities commits states to provide “the same range, quality and standard of free or affordable health care” as for others, and to require health professionals to provide “care of the same quality”^[28]. In Britain, the Equality Act 2010 already requires reasonable steps to avoid putting disabled people at a substantial disadvantage^[29]. The 22.2% of focused reviews in 2024 that found a needed adjustment missing show that duty is not yet met^[3].
• Make health checks reach everyone, and make them autism-aware. Push uptake beyond four in five, make sure people are on the register, and act on LeDeR's call to use checks to spot risk, assess long-term conditions and produce health action plans in accessible versions^[3]. Test, then extend, a check for autistic people without a learning disability^[25].
• Act on the leading avoidable causes. LeDeR's priorities include training care staff to recognise respiratory infection and deterioration, clear escalation pathways, stronger vaccination and better epilepsy management, including identifying those at highest risk^[3].
• Train and resource staff. The Health and Care Act 2022 requires registered providers in England to ensure staff receive training on learning disability and autism appropriate to their role^[30]. Scottish researchers conclude that staff need to be “trained, equipped, resourced and prepared” to work with people who have both conditions^[17].
• Keep counting, and count this group. The 2024 LeDeR report is the last by its current academic partnership, which hopes independently analysed national reporting “will remain an NHS priority”^[3]. NHS England Digital will publish no Health and Care of People with Learning Disabilities statistics in December 2026, citing resource constraints; a replacement dataset covering people with a learning disability, autistic people and people with ADHD is due to report first in summer 2027^[31]. Autistic people with a learning disability should also be reported as a group.
• Look beyond high-income countries. Many world regions have few or no estimates of intellectual disability among autistic people^[1]. The Taiwanese researchers' call to prioritise early detection of disease and health promotion^[10] applies everywhere.

Language: this piece uses identity-first language (“autistic people”), the preference of most autistic-led organisations, and “people with a learning disability”, the wording used by UK self-advocacy groups and services. It uses “intellectual disability” for studies that use that term, including the Scottish census studies, whose authors note that the two terms are synonymous, and clinical terms such as “autism spectrum disorder” 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 compiled this evidence because autistic people, people with a learning disability, their families and self-advocacy organisations deserve the numbers clean, current and in one place, ready to put in front of a commissioner, an MP or a journalist. The case is theirs; our part is to stand alongside it and say plainly what the figures show: the gap is wide, much of it is avoidable, and it is closing too slowly. More of our work is in the Autism & Health research library.

How to read this data

These figures come from very different data: US record-based surveillance, a self- or family-reported census, GP and insurance records, mortality reviews and meta-analyses. Definitions of intellectual disability differ, so shares are not directly comparable. LeDeR reports median age at death, not life expectancy, and notification is not compulsory. The mortality studies use odds ratios, rate ratios and hazard ratios, which are related but not interchangeable, and higher risk alongside an intellectual disability is an association, not proof that the disability itself causes the deaths. Most evidence comes from high-income countries. The UK and Taiwan shares in the first chart are our own calculations from published counts.

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.

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.

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