Explore the reasons behind the recent rise in autism diagnoses across the UK — and what it means if you’re considering assessment.

Understanding the rise in diagnoses

Across the UK, autism diagnoses have increased dramatically over the past two decades.
The Guardian reported in 2024 that recorded diagnoses grew by almost 800 percent between 1998 and 2018. More recently, columnist Rhiannon Lucy Cosslett highlighted how shifting public attitudes and greater openness about neurodiversity have encouraged many people to seek understanding and validation through assessment.
(Read her September 2025 article here →)

At first glance, such figures can seem surprising. But this rise doesn’t mean autism itself is increasing — it reflects better awareness, fairer access, and more inclusive definitions of what it means to be autistic.

What’s driving the increase?

 Greater awareness and acceptance

Autism is now discussed more openly in schools, universities, and the media. This visibility helps people recognise traits in themselves or loved ones and seek assessment without fear of stigma.

Broader diagnostic criteria

Modern diagnostic frameworks such as DSM-5 and ICD-11 recognise a wider range of presentations, communication styles, and sensory experiences, making assessments more inclusive.

Recognition of missed or late diagnoses

Adults, particularly women, non-binary people, and those with co-occurring conditions like ADHD or anxiety, were often overlooked in the past. Many are now being identified for the first time.

Growing demand for self-understanding

More students and young adults are looking for clarity about how they think and learn. Assessment offers insight, access to support, and language for self-advocacy.

Regional variation

The Guardian has also reported major differences between NHS regions, with some assessment centres twice as likely as others to diagnose adults. This potential postcode lottery shows how local policies and resources still affect outcomes.

What it means if you’re seeking assessment

For anyone exploring an autism assessment, this trend is reassuring: society is recognising and valuing neurodiversity more than ever.
However, high demand means long waiting lists in many NHS services. Private assessments can be faster, but always check that the provider follows national guidelines and offers neuroaffirmative practice.

Key reminders:

• Rising diagnosis rates show progress, not over-diagnosis.
• A diagnosis is a framework for understanding, not a label of limitation.
• Neuroaffirmative assessments focus on strengths, context, and lived experience.

Practical next steps

While waiting for an assessment or deciding whether to book one:

• Document your experiences. Keep notes of sensory preferences, routines, or social patterns.
• Request reasonable adjustments. Universities and workplaces can offer support even before formal diagnosis.
• Use reliable UK resources such as the National Autistic Society, Autism Central, and NHS Autism Support.
• Connect with peers through moderated online or local groups for shared experiences.

In summary

The rise in UK autism diagnoses marks a shift toward inclusion and understanding — not alarm. More people are being seen, heard, and supported for who they are.

If you’re exploring an assessment, you are part of this positive change. The process can lead to clarity, community, and the confidence to advocate for yourself.