A child who cannot speak and needs round-the-clock care may receive the same broad diagnosis as an adult with a successful career who only discovers in middle age that they meet autism criteria.
That enormous difference is at the center of a new debate about what the word autism now means.
Dame Uta Frith, a pioneering autism researcher at University College London, argues that the modern definition may have stretched too far.
Writing in Psychological Medicine, she questions whether autism spectrum disorder has become such a large category that it can sometimes blur important differences between people.
Frith has studied autism for more than half a century. Her work helped shape major theories about how autistic people may process social information and details differently, and she was also involved in early research using brain imaging to investigate autism.
That history gives her criticism unusual weight, although it does not make the argument automatically correct. Autism science has changed enormously since Frith began her career, and the people recognized as autistic today are far more diverse than those included in early research.
When autism was first formally described in the 1940s, doctors focused on children with striking developmental and social differences. For decades, autism was generally viewed as a rare and severe childhood condition.
That picture gradually changed. Researchers learned that autistic traits could occur alongside many different levels of intelligence, language ability, independence, and disability, while diagnostic systems broadened to recognize this variation.
Today, autism spectrum disorder brings several previously separate descriptions together under one umbrella. The spectrum concept reflects the fact that autistic characteristics vary from person to person, but Frith asks whether an umbrella can become so large that it stops being sufficiently informative.
The growth in diagnosis is dramatic. Frith contrasts estimates of around four autistic children per 10,000 in British studies from the 1960s with a modern estimate of roughly one autistic child in every 57 UK schoolchildren.
Much of that rise can be explained without assuming a sudden biological increase in autism. Doctors are more aware of the condition, families are more likely to seek assessment, stigma has declined, services have improved, and diagnostic definitions now include people who would not have qualified decades ago.
Frith believes other forces should also be examined. Autism is discussed constantly on social media, in television and film, and in online communities where people compare their experiences and sometimes identify themselves as autistic before receiving a professional assessment.
For many people, these communities can be helpful. They can provide language for experiences that previously felt confusing and can encourage people who were missed in childhood to seek professional help.
But Frith argues that popular descriptions can also simplify autism into common human experiences such as social discomfort, feeling different, liking routines, or becoming overwhelmed. If ordinary difficulties are interpreted too quickly as signs of a disorder, diagnostic boundaries may become less clear.
This is particularly challenging because autism has no single medical test. A clinician cannot diagnose it from a blood sample or one brain scan; assessment instead depends on patterns of behavior and development, information about childhood, interviews, observations, and clinical judgment.
Adult diagnosis can be especially complex when childhood information is limited. People may also arrive for assessment with anxiety, depression, ADHD, trauma histories, or other difficulties that can overlap with some experiences associated with autism.
Frith highlights evidence suggesting that people diagnosed very young may differ as a group from people first diagnosed in adolescence or adulthood. Early-diagnosed individuals more often have noticeable developmental differences and may require substantial support from childhood.
Later-diagnosed people are more likely to have average or high measured intelligence and may have spent years managing social or emotional difficulties without an autism diagnosis. Some recent studies have even reported differences in genetic patterns associated with earlier and later diagnosis.
Those findings are still developing and do not prove that early- and late-diagnosed autism are completely separate conditions. However, Frith argues that they are important enough to question whether scientists should continue treating the entire spectrum as one uniform group.
The discussion also touches on masking, the idea that some autistic people learn to hide or compensate for differences in order to fit into social situations. Masking has become an important explanation for why some people may be diagnosed late, although Frith warns that broad concepts can become difficult to measure consistently.
Another major change is the rise of the neurodiversity movement. It has challenged the idea that every neurological difference should be viewed only as a disorder and has helped many autistic people demand respect, inclusion, and a greater voice in decisions affecting them.
Yet the spectrum also includes people with profound disabilities who may be unable to live independently and whose families require extensive services. Frith worries that treating all these experiences as essentially the same condition may make it harder to describe needs clearly and distribute support fairly.
Her editorial calls for more precise categories and a stronger focus on what each person can and cannot do, rather than relying too heavily on one broad label. Such an approach could potentially improve research as well, because studies combining very different groups may struggle to identify clear biological or psychological patterns.
The paper should not be read as proof that the modern rise in autism diagnosis is mainly caused by overdiagnosis. It is an editorial that interprets existing evidence and raises questions, rather than a population study measuring how many people have been incorrectly diagnosed.
Critics could reasonably argue that narrowing definitions risks repeating an older problem: excluding people whose difficulties are genuine simply because they do not match the most obvious or severe form of autism. Better recognition has allowed many previously overlooked adults and children to access support and understand their experiences.
The most useful lesson may therefore be that broader recognition and diagnostic precision do not have to be opposites. Medicine can acknowledge the full range of autistic people while also developing better ways to describe differences in language, intelligence, daily functioning, mental health, and support needs.
Frith’s editorial was published in Psychological Medicine. Rather than settling the debate, it asks autism researchers and clinicians to confront a fundamental question: when one diagnosis describes people with extraordinarily different lives, how much information does that diagnosis still provide?
If you care about autism, please read studies about food additives and ADHD, and natural fixes for ADHD.
For more information about health, please see recent studies about vitamin D that may hold the clue to more autism, and results showing strange eating habits may signal autism.
Source: University College London.
