Autism did not “start” at a specific moment in history; autistic people have almost certainly existed for as long as humans have, but the medical term and diagnosis are quite recent.

When Did Autism Start?

Two different questions hidden in one

When people ask “when did autism start,” they’re usually mixing together two ideas:

  • When did autistic people first exist?
  • When did doctors start recognizing and naming autism as a condition?

Those have very different answers.

Autistic people vs. the diagnosis

1. Autistic people have likely always existed

Traits we now associate with autism—strong focus on specific interests, sensory differences, social communication differences, and repetitive behaviors—are part of natural human neurodiversity.

History and literature contain many descriptions of “eccentric,” “odd,” or solitary individuals who probably would be recognized today as autistic, even though no such label existed at the time.

In other words, autism did not suddenly appear in the 20th century; our ability to describe and diagnose it did.

So in the sense of human biology and neurodevelopment, autism didn’t “start” at a single date; it has likely been present throughout human history.

When did the word “autism” appear?

  • 1911 – the word “autism” is coined
    Swiss psychiatrist Eugen Bleuler used the term “autism” to describe a feature of schizophrenia—extreme withdrawal into one’s own inner world.
* Here, “autism” did not mean what we now call “autism spectrum disorder.” It was about a symptom in psychosis, not a separate developmental condition.

When did autism become a distinct diagnosis?

Here’s the key part people usually want: when did autism become its own diagnosis , separate from other conditions?

  • 1943 – Leo Kanner’s paper
    • American psychiatrist Leo Kanner published a paper describing 11 children with what he called “early infantile autism.”
* He highlighted:
  * Difficulties with social interaction and communication
  * “Extreme aloneness”
  * A strong need for sameness and routines
* This is widely seen as the **birth of autism as a distinct medical diagnosis.**
  • 1944 – Hans Asperger’s description
    • Austrian pediatrician Hans Asperger described a group of children with social difficulties, intense special interests, and good language and intelligence.
* This later became known as **Asperger’s syndrome** , often considered a “milder” form of autism in older diagnostic systems.
  • 1980 – Autism in the DSM
    • The third edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III) formally listed “infantile autism” as a separate diagnosis, distinct from schizophrenia.
* This helped standardize the criteria doctors used.
  • 2013 – Autism Spectrum Disorder (ASD)
    • With DSM-5, separate labels like “Asperger’s syndrome,” “PDD-NOS,” and “autistic disorder” were combined into one diagnosis: autism spectrum disorder (ASD).
* This reflected the idea of a spectrum: different support needs and traits, but one broad condition.

Mini‑timeline at a glance

[1] [9][3][7][1] [3] [5][7][1][3] [5][9][3] [8][3][5] [9][3][5] [7][9]
Year What happened Why it matters
1799 French physician Jean Itard documented a boy, Victor, with traits resembling what we now associate with autism.Early written case that looks very “autistic” in hindsight.
1911 Eugen Bleuler used the term “autism” for withdrawal in schizophrenia.First use of the word “autism,” but not yet the modern meaning.
1920s Grunya Sukhareva, a Russian child psychiatrist, described children with clear autistic traits.Often overlooked early clinical descriptions of autism-like presentations.
1943 Leo Kanner published on “early infantile autism.”Commonly cited as the start of autism as its own diagnosis.
1944 Hans Asperger described children with what became known as Asperger’s syndrome.Expanded the recognized range of autistic presentations.
1970s Studies began showing autism is linked to brain development and genetics.Shifted thinking away from blaming parenting and toward neurodevelopment.
1980 DSM-III formally listed “infantile autism” as a distinct diagnosis.Gave autism an official place in modern psychiatric diagnosis.
2013 DSM-5 introduced “autism spectrum disorder (ASD)” as a single category.Unified different labels under the idea of an autism spectrum.

How people talk about “when autism started” (forums & trending

conversation)

On forums and social platforms, you’ll see a few recurring viewpoints:

  1. “Autism has always been here; we just didn’t have a name.”
    • Many autistic adults and parents point out that older generations remember “that strange kid” or “odd uncle” who almost certainly would now be identified as autistic.
 * This view emphasizes that what changed is awareness, not the existence of autistic people.
  1. “Why are there so many more cases now?”
    • Rising diagnosis rates are often discussed, with worries that “autism is exploding.”
    • Researchers and clinicians typically explain this using:
      • Broader diagnostic criteria and spectrum thinking
      • Better screening in schools and pediatric care
      • Reduced stigma, so more people seek evaluation
    • These factors likely explain much of the rise in diagnosed cases, rather than autism suddenly starting in modern times.
  1. Debates about causes
    • Online discussions frequently ask “what causes autism,” but there is no single simple cause.
    • Current evidence points to complex genetic factors plus prenatal/early-life influences , not one new environmental trigger that appeared recently.
 * Many autistic people stress that focusing too much on “what caused it” can overshadow the more practical questions: support, inclusion, and quality of life.

Putting it together in one sentence

  • Autistic people likely existed long before history recorded them.
  • The word “autism” was first used in 1911.
  • Autism as a distinct diagnosis really starts with Leo Kanner’s 1943 description of “early infantile autism,” later refined into today’s concept of autism spectrum disorder.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.