Overdiagnosis in UK Mental Health Services: Is it Real? | ADHD & Autism Explained (2026)

The Mental Health Diagnosis Debate: A Critical Examination

In a recent article, John Harris raises concerns about Wes Streeting's review of UK mental health services, suggesting it's a politically motivated move. However, this narrative oversimplifies a complex issue. While it's true that political considerations often influence ministerial decisions, Streeting's review delves deeper into the systemic challenges facing mental health services, particularly in child and adolescent care.

The Crisis in Child and Adolescent Mental Health Services (CAMHS)

The situation in CAMHS is dire. As a former clinical psychologist and member of an autism diagnosis team, I witnessed first-hand the strain on these services. Waiting times for autism assessments have skyrocketed from a few months to over a year, highlighting the urgent need for reform.

Addressing Overdiagnosis: A Necessary Step

It's crucial to acknowledge that overdiagnosis is a legitimate concern. However, it's not a political bandwagon, as some suggest. Clinicians and researchers are engaging in thoughtful discussions about overdiagnosis, recognizing it as a complex issue that requires attention. Reform UK's leaders, known for their controversial stances, are the ones jumping on the bandwagon, not Streeting.

The Importance of Purposeful Diagnosis

Suzanne O'Sullivan's book, “The Age of Diagnosis”, offers a nuanced perspective on diagnosis. She argues that diagnosis should serve a specific purpose and make a tangible difference in patients' lives. Unfortunately, this ideal is often not realized. Additionally, O'Sullivan highlights that appropriate help can be provided without always fitting individuals into diagnostic categories, a concept some struggle to accept.

The Expert Perspective: A Response to John Harris

Allen Frances, a renowned professor and former chair of the American Psychiatric Association's DSM-IV taskforce, provides an expert rebuttal to Harris' claims. Frances asserts that the recent explosion in reported psychiatric diagnoses is a result of several factors, including confusing stress with mental disorder, ignoring symptom context, the rise of online self-diagnosis, vague diagnostic criteria, careless diagnosis by overworked GPs, pharmaceutical marketing, and the linkage of benefits to diagnosis rather than functional ability.

This misdiagnosis epidemic leads to a wasteful distribution of resources, where those with mild symptoms or no real need receive harmful treatments, while those with severe illnesses are left without the care they desperately require.

ADHD: Underdiagnosed or Overlooked?

ADHD UK estimates that there are approximately 2 million individuals in the UK with undiagnosed ADHD. This statistic challenges the notion of overdiagnosis, suggesting instead that we are failing to identify and support those with ADHD. Natasha Fairbairn, a learning support assistant for special educational needs and a parent of a child with ADHD, highlights the commonality of ADHD and the current inability of NHS services to assess and support even a fraction of those affected.

Conclusion: A Call for Balanced Approach

The debate surrounding mental health diagnosis is complex and multifaceted. While overdiagnosis is a valid concern, it's essential to approach this issue with a balanced perspective. The review initiated by Wes Streeting provides an opportunity to address the systemic challenges facing mental health services, including the critical issue of overdiagnosis. By engaging in thoughtful discussions and considering expert opinions, we can work towards a more effective and equitable mental health care system.

Overdiagnosis in UK Mental Health Services: Is it Real? | ADHD & Autism Explained (2026)
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