Major Study Finds No Evidence of ADHD Overdiagnosis in the UK
A comprehensive new paper published in the British Journal of Psychiatry has concluded there is "no evidence that attention deficit hyperactivity disorder (ADHD) is overdiagnosed in the UK." The research, led by a team of 32 experts including clinicians, academics, and patients from across the nation, suggests the condition could even be underdiagnosed, with clinical services struggling to meet demand.
Rising Diagnosis Rates Linked to Greater Awareness
The authors highlight that health records show a clear increase in ADHD diagnosis rates within clinical services between 2000 and 2018. However, they emphasise this rise is still "substantially below the ADHD population prevalence in the UK." Estimates indicate around one in 20 children (5.4%) and 3.3% of adults have ADHD, suggesting many remain undiagnosed.
Professor Samuele Cortese from the University of Southampton, the lead author, told the Press Association: "We are diagnosing more ADHD in the past decade, but there are still many with ADHD who are out there but despite this they're not diagnosed. Certainly this increase means that there is more awareness now. But the problem is that we are not yet meeting the need of these people."
Services Cannot Adequately Support Those in Need
The paper warns that the primary issue is that UK clinical services "cannot adequately support" individuals with ADHD who require assistance. The researchers expressed concern that "alarmist" rhetoric claiming overdiagnosis could be used to deny properly-diagnosed patients the care they deserve.
Professor Tamsin Ford, head of the Department of Psychiatry at the University of Cambridge and a co-author, stated: "While many more people with ADHD are being recognised and treated, we are failing to support many more. Overdiagnosis is not a problem, but misdiagnosis may be as people are driven into the private sector by long waits; and sadly, missed diagnoses remain common."
Acknowledging Risks of Misdiagnosis
While arguing against overdiagnosis, the experts acknowledged that some individuals may have been misdiagnosed with ADHD. They cited potential causes including low-quality assessments, poor adherence to national guidance, or inappropriate differential diagnosis. The paper also notes a tendency over time to recognise more "mild" ADHD cases, indicating more research is needed in this area.
Professor Cortese added: "Certainly we acknowledge, of course, that another issue is that probably some who have received a diagnosis of ADHD, probably they don't have ADHD – they are misdiagnosed with other things. But overall, the situation is such that still there is an unmet need for these people."
Significant Risks of Untreated ADHD
The study underscores the serious consequences of untreated ADHD, which can expose individuals and their families to significant risks. These include:
- Accidental and traumatic injuries
- Car accidents
- Increased suicide risk
- Substance misuse
- Higher mortality rates
Professor Cortese described this as "quite concerning," emphasising the importance of proper treatment and support.
Government Review into ADHD and Autism Services
In December, the Government launched a comprehensive review into ADHD, autism, and mental health services. Officials aim to examine the rising demand for these services and understand the underlying drivers.
Health Secretary Wes Streeting said at the time: "We must look at this through a strictly clinical lens to get an evidence-based understanding of what we know, what we don't know, and what these patterns tell us about our mental health system, autism and ADHD services. That's the only way we can ensure everyone gets timely access to accurate diagnosis and effective support."
The new research provides crucial evidence for this review, challenging narratives of overdiagnosis while highlighting systemic failures in service provision and the urgent need for improved clinical pathways and support for those affected by ADHD across the UK.
