Autism
Autism in adults: signs that get missed
Around 750,000 autistic adults in England are estimated to be undiagnosed. Here are the signs, what late diagnosis changes, and how to access assessment.
Autism wasn't as well recognised when many of us were growing up. A UCL study in 2023 estimated that around 750,000 autistic adults in England are undiagnosed. Autism wasn't diagnosed much in adults — or in girls and women — until relatively recently, and it means that many parents are having epiphanies in later life when exploring what is happening with their children.
This happened to my husband, who realised he had been misdiagnosed with dyslexia at school; all along he had autism, but it wasn't diagnosed until his late thirties.
If you're a parent reading this and wondering whether what you're seeing in your child also describes you, that's extremely common. Many parents discover their own autism in the process of getting their child diagnosed.
Why autism gets missed in adults
The same mechanisms that cause autism to be missed in girls apply through adulthood: masking, camouflaging, and the fact that autistic adults who are verbally fluent and socially functional are rarely flagged by the systems designed to catch it.
By adulthood, many autistic people have spent decades developing sophisticated strategies for appearing neurotypical. They've built scripts for social situations, learned which environments they can tolerate and which they can't, and often developed anxiety, depression, or exhaustion as secondary consequences of the sustained effort involved. Adults seeking help for anxiety or depression may have the underlying autism missed entirely.
Research consistently shows that autistic adults are at significantly higher risk of anxiety and depression than the general population. For people who've been living without the explanation of an autism diagnosis, those conditions often make more sense in retrospect.
Signs of autism in adults that are commonly missed
The textbook presentation — the non-verbal child lining up objects — describes a small minority of autistic people. Adult autism, particularly in people without intellectual disability, often looks like this:
What it looks like — and what it actually is
Tap each card to reveal the autistic framing.
None of these is diagnostic alone — the pattern across several is what matters.
Social and communication
- Difficulty with unwritten social rules; following the literal meaning of words rather than the implied one
- Finding small talk effortful or meaningless; preferring deeper, more structured conversation
- Misreading tone or body language; frequently misinterpreting others' intentions
- Friendships that feel one-sided, draining, or that involve extensive preparation and debrief
- Social anxiety that's specifically about unpredictability or not knowing the rules, rather than general shyness
Sensory and environment
- Strong reactions to certain sounds, textures, smells, or light
- Difficulty in busy, unpredictable environments: open-plan offices, shopping centres, crowded social events
- Strong food preferences or aversions related to texture, colour, or temperature
Routine and regulation
- Significant distress at disruption to routine or last-minute changes
- Difficulty switching between tasks; transitions are effortful even between enjoyable things
- Periods of exhaustion or burnout after socially demanding phases
- Autistic burnout: extended periods of significant fatigue, reduced functioning, and withdrawal after prolonged masking
Pattern recognition
- Noticing you relate to descriptions of autism when they come from autistic people rather than clinical checklists
- A sense of having always felt different without being able to explain why
- Relief when an autistic child's experience is described and it resonates
None of these is diagnostic on its own. But if several of them are consistently true, an assessment is worth pursuing.
How to get an autism assessment as an adult
Start with your GP. Explain specifically what you're experiencing and why you think autism might be relevant. An NHS referral for adult autism assessment faces long waits — in some areas over two years — but it is available.
Under NHS Right to Choose, you can ask your GP to refer you to an approved independent provider rather than joining the local waiting list; this can significantly reduce waiting time in some areas.
Private adult autism assessment typically costs £1,200–2,000 and produces a clinically valid report. Adult services often use the ADOS-2 and a detailed developmental history interview. Look for clinicians with specific experience of late-diagnosed adults and the female autism phenotype if that's relevant.
A diagnosis in adulthood doesn't change your history, but it does change how you understand it — and what support you can access going forward.
This article is part of the Neuroequipped Autism guide. For an overview of autism, see What is autism?. For the assessment process in detail, see Autism assessment: NHS and private options. For autism and ADHD together, see Autism and ADHD: when they overlap. For autism in girls and women, see Autism in girls: why it looks different. For PIP and financial support, see Autism and PIP.
Neuroequipped provides research-grounded information for parents and educators. It is not medical advice. If you have concerns about your own presentation, speak to your GP.