Undiagnosed ADHD: Why Support Shouldn't Have to Wait for a Diagnosis

Undiagnosed ADHD is far more common than most people assume, and for years, real support in the UK has largely depended on getting a diagnosis first. A new Ombudsman report says that has to change. Here is what it actually means, and what you can do about your own support right now, whether you have a diagnosis or not.

Undiagnosed ADHD is when someone has ADHD but has never received a formal clinical diagnosis, whether because they have not been assessed, are stuck on a waiting list, or have never sought one at all. NHS England estimated in its August 2026 ADHD management data that 2.48 million people in England have ADHD, the large majority without a diagnosis, and research linked to NHS data reported by UCL suggests only around 1 in 9 people with ADHD have it recorded on their GP file. For years, that gap has mattered enormously, because quality support in the UK has largely been gated behind a diagnosis that is notoriously difficult to get. A new report from the Parliamentary and Health Service Ombudsman, published this week, argues that has to change, and that support should not have to wait for a diagnosis to arrive.

What Does It Actually Mean to Have Undiagnosed ADHD?

It means the condition is real and present in someone's daily life, but there is no clinical letter confirming it. That distinction matters more in the UK than it should, because so much of the system, from workplace policy to school provision to medication, has historically been built around the assumption that a diagnosis comes first and support follows. In practice, for a huge number of adults, it works the other way round. People spend years building their own coping systems, often without knowing why ordinary tasks cost them so much more than they seem to cost everyone else, long before anything gets a name.

Being undiagnosed does not mean ADHD is mild, or that someone is imagining the difficulty. It usually means one of a small number of things: they are on an assessment waiting list, they cannot afford or access a private assessment, they were missed earlier in life because their presentation did not match outdated stereotypes, or they have simply never had a reason to seek a formal process for something they have already learned to manage. My own ADHD went unrecognised for years before anyone put a name to it, and that gap between living with something and having it formally confirmed is exactly where most people spend the most time.

Why Are So Many UK Adults With ADHD Undiagnosed?

Mostly because the route to a diagnosis is genuinely hard to get through, not because people are not looking for one. Hundreds of thousands of adults are currently sitting on NHS ADHD assessment waiting lists, some for years rather than months. Private assessment exists as an alternative, but it costs several hundred pounds that not everyone has spare, and the Ombudsman's new report specifically flags confusion around patients' right to choose an eligible provider under the NHS, with some people wrongly told they could not use it at all.

There is also a recognition problem that sits underneath the waiting lists. ADHD research and diagnostic criteria were shaped for decades around how the condition tends to present in young boys, which means adults, and particularly women, whose ADHD looks more like internal overwhelm than visible hyperactivity, were routinely missed. Many only get assessed after a lifetime of being told they were simply disorganised, too sensitive, or not trying hard enough. That historical bias, combined with a system that still treats diagnosis as a single narrow gateway, is a large part of why the undiagnosed number is so high today.

What Does the New Ombudsman Report Actually Say?

The Parliamentary and Health Service Ombudsman published "Improving Access to ADHD and Autism Assessment and Treatment: Commissioning With Confidence" on 26 August 2026, drawing on 3,000 complaints from patients and families across England. It describes a system that is, in the Ombudsman's own words, too complex and inconsistent, leaving too many people falling through the gaps. Ombudsman Paula Sussex was blunt about the human cost, noting that many people end up feeling forced to pay to go private, which she called "not what good public services should look like".

The scale of the problem is stark in the complaint numbers alone. Complaints to the Ombudsman about ADHD and autism services rose from 410 in 2021/22 to 1,257 in 2025/26, more than tripling in five years. The report catalogues long waiting times, variations in access depending on where you live, fragmented care between health, education and employment, and a regulatory gap around diagnostic-only providers that leaves commissioners, clinicians and patients all uncertain about the quality of what is on offer. Reading through it, the throughline is consistent: outcomes should not depend so heavily on whether someone has managed to get through the diagnostic process, because that process itself is currently one of the biggest barriers in the whole system. Real, usable support, across health, education and employment, needs to exist on its own terms, not as something unlocked only once a diagnosis has landed.

Reports like this can feel like they disappear into a drawer, so the compliance history is worth knowing. The Ombudsman's recommendations are not legally enforceable, but they carry real weight through public reporting and parliamentary scrutiny, and historically around 99% of the individual recommendations the Ombudsman makes do get implemented, based on official figures reviewed by the Public Administration and Constitutional Affairs Committee. That is genuinely one of the more encouraging things about this particular report. It is not a wishlist with no teeth. It is a body with a strong track record of being listened to, pointing directly at the diagnosis-gated model of support and saying it needs to change.

Does This Mean You Can Get Support Without a Diagnosis Right Now?

Partly, and it is worth being honest about where the line currently sits. This is a set of recommendations to the system, not a change in the law that takes effect overnight, so nothing about NHS commissioning shifts the day the report is published. What has not changed either is medication access. NHS ADHD medication still requires a formal diagnosis and a prescribing clinician, and that is not something this report alters or something we would ever suggest working around.

What is already true, and has been true throughout, is that a lot of meaningful support does not actually require a diagnosis at all. Workplace adjustments under the Equality Act 2010 apply based on impact on your day-to-day life, not on paperwork. Non-medication strategies around sleep, structure and external memory work whether or not you have a letter confirming why you need them. And tools built around how ADHD brains actually function, Romi included, are available to anyone who recognises themselves in the description, whether that recognition has been formalised yet or not. The report's real significance is in pushing the system to catch up with something that is already true in practice: a diagnosis explains a lot, but it should never be the price of entry for help.

What Can You Actually Do While You Wait, or Without a Diagnosis at All?

None of this is a substitute for pursuing a diagnosis if you want one, and it is always worth getting on a waiting list even if the wait itself is long, because the eventual outcome, including medication if it is right for you, does matter. But you do not have to put your life on hold until then. A few things genuinely help in the meantime:

1. Get on the NHS waiting list, then stop waiting on it for everything else. There is a lot you can do to cope and function while you wait, and starting the referral early means the clock is already running while you build other support around it.
2. Ask for what would help at work now, not after a diagnosis. Reasonable adjustments apply based on impact, and you can ask for them today, whether or not you decide to name ADHD specifically when you do.
3. Decide deliberately whether to tell your employer, rather than avoiding the question. There is a real trade-off either way, and it is worth making the choice on purpose rather than by default.
4. Build systems that do not depend on a label to be worth using. Structure and routines that work with an ADHD brain help just as much before a diagnosis as after one.
5. If you manage or employ people, do not make paperwork the precondition for support. The most effective workplace adjustments are cheap, help the whole team, and do not require anyone to produce a diagnosis first.
6. If you can access it, use Right to Choose to pick your provider. The Ombudsman's report specifically flags that patients are entitled to choose an eligible NHS-funded provider, including some independent ones, so it is worth checking your options rather than assuming you are stuck with a single local pathway.

How Romi Helps While You're Waiting, or Without a Diagnosis at All

Romi was built on exactly this principle. It is a wellbeing companion for adults who live with ADHD, not a medical device, and it has never asked anyone for a diagnosis before it helps.

• If you recognise yourself in this article but have not been assessed, Romi does not gatekeep support behind a formal letter. It works with how your brain actually functions, today
• It helps turn scattered thoughts and half-finished intentions into a plan you can actually follow, which is useful whether you are on week one of a waiting list or year ten of managing things yourself
• It was built by a team that includes neurodivergent people, several of whom went years before getting a diagnosis themselves, so the tool reflects lived experience of exactly this gap, not a clinical checklist
• If waiting for answers is stressful in itself, Romi's Regulate section has tools for exactly that moment, including Interrupt the Spiral for the uncertainty loop that waiting tends to create

A diagnosis can still matter, especially if medication turns out to be right for you. But it should never be the thing standing between you and every other kind of help. That is the whole argument of this week's report, and it is the argument Romi has been built around from the start.

Frequently Asked Questions

What does undiagnosed ADHD mean?

Undiagnosed ADHD means someone has ADHD but has not received a formal clinical diagnosis, whether because they are waiting for an assessment, cannot access one, or have never sought one. It does not mean the condition is mild or imagined. It means there is no clinical letter confirming what is already true in day-to-day life.

How common is undiagnosed ADHD in UK adults?

Very common. NHS England estimated in August 2026 that 2.48 million people in England have ADHD, the majority without a diagnosis, and separate research linked to NHS data suggests only around 1 in 9 people with ADHD have it recorded on their GP record. Being undiagnosed is closer to the norm than the exception.

Do I need a diagnosis to get support for ADHD?

Not for everything. Workplace adjustments under the Equality Act 2010, non-medication strategies, and tools like Romi are all available without a formal diagnosis. What you cannot access without one is NHS ADHD medication, since that requires a prescribing clinician and a confirmed diagnosis.

What is the new Ombudsman report about ADHD and autism services?

It is a report from the Parliamentary and Health Service Ombudsman, published 26 August 2026 and based on 3,000 complaints, called "Improving Access to ADHD and Autism Assessment and Treatment: Commissioning With Confidence". It documents long waits, fragmented care and confusion over patients' right to choose a provider, and argues the system needs to stop treating diagnosis as the gateway to all support.

Why are so many adults with ADHD, especially women, undiagnosed?

A large part of the reason is historical. ADHD research and diagnostic criteria were shaped for decades around how the condition presents in young boys, which meant adults, and particularly women whose ADHD looks more like internal overwhelm than visible hyperactivity, were routinely missed. Long NHS waiting lists and the cost of private assessment add to the gap on top of that.

Can I ask for workplace adjustments without an ADHD diagnosis?

Yes. The legal duty to make reasonable adjustments under the Equality Act 2010 applies where a condition has a substantial, long-term effect on your ability to do your job, whether or not you have a formal diagnosis yet. You can ask for support while you are on a waiting list or without ever seeking a diagnosis at all.

How long is the NHS ADHD assessment waiting list?

It varies significantly by area, but hundreds of thousands of UK adults are currently on NHS ADHD assessment waiting lists, and waits of a year or more are common in many parts of the country. Getting referred early matters precisely because the wait itself tends to be long.

Will the Ombudsman's recommendations actually change anything?

There is a genuine reason for optimism. The recommendations are not legally binding, but historically around 99% of the individual recommendations the Ombudsman makes do get implemented, based on official figures reviewed by Parliament's Public Administration and Constitutional Affairs Committee. Change will still take time to reach the system in practice.

By Josh Budd | Founder @ Romi