Autism
The National Autistic Society describe autism as a lifelong neurodivergence and disability which influences the way people with autism interact and experience the world. Individuals with an autism diagnostic share characteristic differences from non-autistic people in the way that they think, feel and communicate.
Find out more information here on what autism means on the link here: What is autism.
The National Institute for Health and Care Excellence (2020) indicates that autism is present in 1.1% of individuals in the UK.
The number of autism diagnoses in the UK surged dramatically by 787% between 1998 and 2018, with adults experiencing the most significant increase across all age groups (Russell et al., 2021).
Following the introduction of the Autism Act (2009) and the first Autism Strategy in 2010 in England, increased awareness and improved diagnostic services likely account for this observed increase (National Autistic Society, 2020).
Hywel Dda health board have seen a 12-fold increase in the number of children waiting more than a year for an autism assessment - from 194 children in 2019 to 2,391 in 2024. Hywel Dda have also seen more than a 400% increase in the number of autism referrals received - 614 in 2019 compared with 3,326 in 2024.
Hywel Dda Health Board Stats:
2022: 2593
2023: 3158
2024: 4030
Longest wait in days: 1705
Current estimates suggest that around 1 in every 100 people in the UK are diagnosed with autism, or approximately 700,000 individuals.
However, recent research from Cardiff University strongly implies that the true number is much higher, as evidenced by significant increases in diagnostic rates among previously under-identified groups.
Specifically:
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Diagnosis rates saw a substantial 150% increase between 2008 and 2016.
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There is a growing trend of diagnoses in adults over the age of 35.
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Diagnoses for women saw a dramatic eightfold increase between 2000 and 2016.
These findings suggest that while the current official prevalence stands at 1 in 100, this figure likely significantly underestimates the total autistic population because a large portion remains unidentified by healthcare systems.
Read more on the study by clicking here.
There is currently no waiting time policy or target for adults. Those seeking an autism diagnosis through the Integrated Autism Services (IAS) in the last quarter of 2022-23 faced a national average wait of 95.1 weeks.
ADHD
The NHS refer to ADHD (attention deficit hyperactivity disorder) as a condition where the brain works differently to most people, individuals with ADHD may have difficulties concentrating and sitting still.
Find out more information by clicking here on what ADHD means for children and young people.
Find out more information by clicking here on what ADHD means for adults.
The Welsh Government as of 2025, exploring all-age support services for ADHD and Tourette syndrome and developing specifications for a national approach for service reform.
As of March 2023, Hywel Dda Health Board has 2,028 adults waiting for an ADHD assessment, with an average wait time of 58 weeks. The longest wait time for an adult ADHD assessment is 443 weeks.
As of March 2023, there were 387 children waiting for an ADHD assessment, a decrease from 433 the year prior. The longest waiting time for a CYP ADHD assessment is three hundred and forty-seven (347) weeks.
There have been a national increase in waits for neurodevelopmental assessments, with a rise of under 17s in Wales waiting more than a year for ADHD assessments.
Tourette’s
Tourette Syndrome (TS), as defined by Tourettes Action UK, is a neurological condition characterised primarily by tics – involuntary and uncontrollable sounds and movements. It's often accompanied by other co-occurring conditions and features, making it a complex condtion.
Around 60% of people living with tourettes, also have ADHD. Typical symptoms include eye blinking, face grimacing and nose twitching, top lip pouting and head nodding. Those living with tourettes may also suffer from insomnia, self-harming and OCD as the result of their Tourette’s.
A large study in 2014, followed up over 6000 pregnant mothers and their children over time. It found the strongest risk factor was inadequate weight gain during pregnancy, use of cannabis and alcohol and whether the child was the first born.
Read the study by clicking here.