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Autism

What it is

A lifelong neurodevelopmental difference in social communication and in patterns of interests, routines, and sensory experience. Support needs vary enormously from person to person.

Common experiences

Many autistic people describe deep focus, pattern recognition, honesty, and strong passions, alongside sensory overload, burnout from masking, and being misunderstood.

What helps

Clear, direct language; predictable plans; sensory-friendly spaces; respect for stimming; AAC for people who need it. Ask each person which words they prefer.

Across life

Signs often appear in early childhood, such as differences in play, speech, eye contact, or reactions to change, but many people, including many women and girls, are identified in adolescence or adulthood. Masking, hiding traits to fit in, is common and can be exhausting.

Evaluation and treatment

Evaluation is by a clinician such as a psychologist, developmental pediatrician, or psychiatrist, using interviews, history, and observation. Supports can include speech-language therapy, occupational therapy, AAC, and school or workplace accommodations. No medication treats autism itself; medication may help co-occurring conditions such as anxiety or ADHD.

Myth vs fact

Myth: autistic people lack empathy. Fact: many feel empathy deeply but express it differently. Autistic researcher Damian Milton describes a double empathy problem, a two-way gap in understanding between autistic and non-autistic people.

Full chapter

How understanding of autism developed

Leo Kanner (1943) published the first widely cited clinical descriptions of autism in children. Lorna Wing and Judith Gould (1979) showed that the same pattern of social communication differences and repetitive behaviors appears across a wide range of abilities, which led to the idea of a spectrum. In 2013 the DSM-5 combined earlier separate labels, including autistic disorder and Asperger's disorder, into one diagnosis, autism spectrum disorder. The ICD-11 follows a similar approach.

Diagnostic criteria

The DSM-5-TR diagnoses autism spectrum disorder when a person has lasting differences in social communication and interaction across settings, together with restricted or repetitive patterns of behavior, interests, or activities, including sensory differences. These features begin in the developmental period, though they may not be obvious until social demands exceed a person's coping strategies, and they affect daily life. Clinicians also note the level of support needed and whether language or intellectual differences accompany autism.

How common it is and what causes it

In U.S. surveillance of 8-year-olds, about 1 in 36 children (2.8 percent) were identified as autistic in the 2020 data (Maenner et al., 2023); newer reports have found higher estimates, which reflects wider awareness and identification. Autism is strongly heritable and involves many genes and influences on early brain development (Lord et al., 2018). Vaccines do not cause autism; a meta-analysis of studies including more than a million children found no link (Taylor et al., 2014). Boys are identified more often than girls, but a meta-analysis suggests the true ratio is nearer 3 to 1 than 4 to 1, which implies many girls and women go unrecognized (Loomes et al., 2017).

A spectrum of profiles, not a line

Autism is not a scale from mild to severe. Autistic people have different profiles: some speak fluently, some use AAC or speak little, some live independently, and some need substantial daily support. The Lancet Commission on autism (Lord et al., 2022) introduced the term profound autism for autistic people who need round-the-clock support, usually with minimal language and intellectual disability. Some advocates debate the term, but the underlying point stands: support needs vary enormously, and everyone deserves the support they need. Needs can also shift with stress, sensory load, health, and life stage.

How autism can look in daily life

Social communication differences can include difficulty reading unspoken rules, preferring direct and literal language, finding small talk draining, and building friendships around shared interests. Many autistic people value routine and predictability and feel distress when plans change without warning. Sensory experience often differs: ordinary sounds, lights, textures, or smells may be overwhelming, while other inputs are sought out or go unnoticed (Robertson & Baron-Cohen, 2017). Monotropism theory proposes that autistic attention is often deeply focused on a few things at a time, which can explain both intense engagement and difficulty switching tasks (Murray et al., 2005).

Stimming and special interests

Stimming means repetitive movements, sounds, or actions such as hand flapping, rocking, humming, or fidgeting. Autistic adults describe stimming as a way to manage emotions and sensory input, to focus, and to express joy, and many say it should be allowed unless it causes harm (Kapp et al., 2019). Intense interests are a source of knowledge, wellbeing, and connection, and can become the basis of study, work, and community.

Meltdowns, shutdowns, and inertia

A meltdown is an intense, involuntary response to overwhelm and is not a tantrum; it may involve crying, shouting, or a physical release. A shutdown is a pulling inward, with silence, reduced movement, or a reduced ability to speak. Autistic inertia is difficulty starting, stopping, or switching activities, even ones the person wants to do (Phung et al., 2021; Buckle et al., 2021). Helpful responses reduce demands and sensory input, avoid punishment and pressure to talk, allow recovery time, and look for triggers afterward. Writing a personal plan while calm, such as the one in the Toolkit, can help.

Masking and burnout

Many autistic people suppress traits or copy non-autistic behavior, called camouflaging or masking. Autistic adults interviewed by Hull and colleagues (2017) described camouflaging as exhausting and as affecting their sense of identity. Raymaker and colleagues (2020) described autistic burnout as long-lasting exhaustion, loss of skills, and reduced tolerance to stimulation, arising from chronic stress and a mismatch between demands and supports. Recovery usually involves rest, fewer demands, better supports, and, where it is safe, being able to stop masking.

Communication, empathy, and AAC

Milton (2012) proposed the double empathy problem: communication breakdowns between autistic and non-autistic people are mutual, arising from different ways of experiencing the world, rather than a deficit located only in the autistic person. A study of information passed along chains of people found that transfer between autistic people was as effective as between non-autistic people, and that mixed chains lost more information (Crompton et al., 2020). Some autistic people speak little or not at all; augmentative and alternative communication (AAC), such as picture boards, speech-generating devices, and typing, can give access to communication (Beukelman & Light, 2020). Competence should be presumed, and AAC should be set up so the person controls their own choices.

Co-occurring conditions and health

ADHD and anxiety disorders are among the most common co-occurring conditions in autistic people (Lai et al., 2019). In a large health-system study, autistic adults had higher rates of many physical and mental health conditions than other adults (Croen et al., 2015). Health care works better with longer appointments, written information, advance notice, a quiet waiting space, and clinicians who ask how the person communicates pain and distress.

Mental health and safety

A meta-analysis estimated that roughly one in four autistic adults had current anxiety or depression (Hollocks et al., 2019). Research has also found an increased risk of early death among autistic people, including from suicide (Hirvikoski et al., 2016). Stigma, exclusion, burnout, and unmet support needs all contribute, and autistic adults who feel accepted by others and by themselves report better mental health (Cage et al., 2018). Support that fits sensory and communication needs, and communities that accept autistic people, protect wellbeing. If you are struggling or having thoughts of suicide, please see the Crisis help page.

Getting evaluated

For children, the American Academy of Pediatrics recommends autism-specific screening at 18 and 24 months in addition to ongoing developmental surveillance (Hyman et al., 2020). Screening tools such as the M-CHAT-R/F (Robins et al., 2014) flag who needs a full evaluation but do not diagnose. A diagnostic evaluation by a qualified clinician combines developmental history, direct observation, and structured assessment. Adults can also be assessed; clinicians experienced with adults, and with how autism presents in women and in people who mask, are valuable, since late-diagnosed women have described being missed for years (Bargiela et al., 2016). Online quizzes cannot diagnose but can help you decide whether to seek an evaluation. Waiting lists and costs can be long, and you are welcome here with or without a formal diagnosis.

Support at school, work, and in the community

For children and young adults, a large review identified practices including visual supports, task analysis, scripting, social narratives, video modeling, and parent-implemented interventions as evidence-based (Wong et al., 2015). An updated review of early childhood intervention studies concluded that most of the evidence is of low certainty and that research needs better methods and outcomes that matter to autistic people (Sandbank et al., 2023). In school, supports can include clear expectations, predictable transitions, sensory breaks, and an individualized education plan where available. At work, adjustments such as written instructions, a quiet workspace, flexible schedules, and clear feedback often matter more than any single skill. Strong visual search and pitch discrimination have been found in some autistic people (Mottron et al., 2006), and a good fit between a person's strengths and a role benefits everyone.

Respectful language and identity

Many autistic self-advocates prefer identity-first language (autistic person); others prefer person-first wording. Bottema-Beutel and colleagues (2021) discuss why wording matters and recommend avoiding language that frames autism as a deficit or disease, such as describing someone as high-functioning or low-functioning. When unsure, ask the person.

For families, friends, and colleagues

Ask how the person prefers to communicate and what helps. Give clear, concrete information and advance notice of changes, offer plans in writing, and allow quiet breaks. Believe reports of sensory pain, do not force eye contact or stop harmless stimming, and presume competence. Focus on connection and on the person's own goals. Parents and carers also need support, and many autistic adults are parents, partners, and caregivers themselves. The Resources page lists autistic-led and family organizations.

Sources

  1. American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.).
  2. World Health Organization. International Classification of Diseases, 11th Revision (ICD-11), section on autism spectrum disorder.
  3. Kanner, L. (1943). Autistic disturbances of affective contact. Nervous Child, 2, 217-250.
  4. Wing, L., & Gould, J. (1979). Severe impairments of social interaction and associated abnormalities in children: Epidemiology and classification. Journal of Autism and Developmental Disorders, 9(1), 11-29.
  5. Maenner, M. J., et al. (2023). Prevalence and characteristics of autism spectrum disorder among children aged 8 years: Autism and Developmental Disabilities Monitoring Network, 11 sites, United States, 2020. MMWR Surveillance Summaries, 72(2), 1-14.
  6. Loomes, R., Hull, L., & Mandy, W. P. L. (2017). What is the male-to-female ratio in autism spectrum disorder? A systematic review and meta-analysis. Journal of the American Academy of Child & Adolescent Psychiatry, 56(6), 466-474.
  7. Lord, C., Elsabbagh, M., Baird, G., & Veenstra-Vanderweele, J. (2018). Autism spectrum disorder. The Lancet, 392(10146), 508-520.
  8. Taylor, L. E., Swerdfeger, A. L., & Eslick, G. D. (2014). Vaccines are not associated with autism: An evidence-based meta-analysis of case-control and cohort studies. Vaccine, 32(29), 3623-3629.
  9. Lord, C., et al. (2022). The Lancet Commission on the future of care and clinical research in autism. The Lancet, 399(10321), 271-334.
  10. Murray, D., Lesser, M., & Lawson, W. (2005). Attention, monotropism and the diagnostic criteria for autism. Autism, 9(2), 139-156.
  11. Robertson, C. E., & Baron-Cohen, S. (2017). Sensory perception in autism. Nature Reviews Neuroscience, 18(11), 671-684.
  12. Kapp, S. K., et al. (2019). 'People should be allowed to do what they like': Autistic adults' views and experiences of stimming. Autism, 23(7), 1782-1792.
  13. Phung, J., Penner, M., Pirlot, C., & Welch, C. (2021). What I wish you knew: Insights on burnout, inertia, meltdown, and shutdown from autistic youth. Frontiers in Psychology, 12, 741421.
  14. Buckle, K. L., Leadbitter, K., Poliakoff, E., & Gowen, E. (2021). 'No way out except from external intervention': First-hand accounts of autistic inertia. Frontiers in Psychology, 12, 631596.
  15. Hull, L., et al. (2017). 'Putting on my best normal': Social camouflaging in adults with autism spectrum conditions. Journal of Autism and Developmental Disorders, 47(8), 2519-2534.
  16. Raymaker, D. M., et al. (2020). 'Having all of your internal resources exhausted beyond measure and being left with no clean-up crew': Defining autistic burnout. Autism in Adulthood, 2(2), 132-143.
  17. Milton, D. E. M. (2012). On the ontological status of autism: the 'double empathy problem'. Disability & Society, 27(6), 883-887.
  18. Crompton, C. J., Ropar, D., Evans-Williams, C. V., Flynn, E. G., & Fletcher-Watson, S. (2020). Autistic peer-to-peer information transfer is highly effective. Autism, 24(7), 1704-1712.
  19. Beukelman, D. R., & Light, J. C. (2020). Augmentative and Alternative Communication: Supporting Children and Adults with Complex Communication Needs (5th ed.). Paul H. Brookes Publishing.
  20. Lai, M.-C., et al. (2019). Prevalence of co-occurring mental health diagnoses in the autism population: a systematic review and meta-analysis. The Lancet Psychiatry, 6(10), 819-829.
  21. Croen, L. A., et al. (2015). The health status of adults on the autism spectrum. Autism, 19(7), 814-823.
  22. Hollocks, M. J., et al. (2019). Anxiety and depression in adults with autism spectrum disorder: a systematic review and meta-analysis. Psychological Medicine, 49(4), 559-572.
  23. Hirvikoski, T., et al. (2016). Premature mortality in autism spectrum disorder. British Journal of Psychiatry, 208(3), 232-238.
  24. Cage, E., Di Monaco, J., & Newell, V. (2018). Experiences of autism acceptance and mental health in autistic adults. Journal of Autism and Developmental Disorders, 48(2), 473-484.
  25. Hyman, S. L., Levy, S. E., Myers, S. M., & Council on Children with Disabilities. (2020). Identification, evaluation, and management of children with autism spectrum disorder. Pediatrics, 145(1), e20193447.
  26. Robins, D. L., et al. (2014). Validation of the Modified Checklist for Autism in Toddlers, Revised with Follow-up (M-CHAT-R/F). Pediatrics, 133(1), 37-45.
  27. Bargiela, S., Steward, R., & Mandy, W. (2016). The experiences of late-diagnosed women with autism spectrum conditions: An investigation of the female autism phenotype. Journal of Autism and Developmental Disorders, 46(10), 3281-3294.
  28. Wong, C., et al. (2015). Evidence-based practices for children, youth, and young adults with autism spectrum disorder: A comprehensive review. Journal of Autism and Developmental Disorders, 45(7), 1951-1966.
  29. Sandbank, M., et al. (2023). Autism intervention meta-analysis of early childhood studies (Project AIM): updated systematic review and secondary analysis. BMJ, 383, e076733.
  30. Mottron, L., Dawson, M., Soulieres, I., Hubert, B., & Burack, J. (2006). Enhanced perceptual functioning in autism: An update, and eight principles of autistic perception. Journal of Autism and Developmental Disorders, 36(1), 27-43.
  31. Bottema-Beutel, K., et al. (2021). Avoiding ableist language: Suggestions for autism researchers. Autism in Adulthood, 3(1), 18-29.

Citations are listed so you can verify claims and read further. Guidance is revised over time, so check for newer editions.

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