Quick answer: ADHD is lifelong. Trouble with attention, organisation and impulse control goes back to childhood and shows up even on calm days. Anxiety is driven by worry or fear, so concentration slips when your mind is busy with “what if” and usually recovers when the worry eases. A psychiatrist separates the two with a detailed history, not a quiz.
You have read the same email four times. Your heart is going, your head is somewhere else, and you honestly can’t tell whether you’re anxious, scattered, or both. Plenty of people across the UK land in exactly this spot, and the frustrating truth is that the two conditions can look almost identical from the outside. Often they look identical from the inside too.
This guide explains how a consultant psychiatrist tells ADHD and anxiety apart, what a proper UK assessment covers under NICE guidance, how common it is to have both, and what your options are in England, whether you live in London or elsewhere in the UK. It is general information and not a diagnosis.
Why ADHD and anxiety are so easy to confuse
The overlap is real. The NHS lists restlessness, irritability, difficulty concentrating, tiredness and poor sleep as symptoms of generalised anxiety disorder (GAD). Every one of those can also describe someone with untreated ADHD. Hand a clinician a list of those complaints and you could be describing either condition.
There is a second problem: one often feeds the other. If you’ve spent years missing deadlines, losing keys and forgetting appointments, you will probably become anxious about it. That anxiety is genuine, but it may be the shadow of ADHD rather than the main event. The Royal College of Psychiatrists’ good-practice report on adult ADHD (CR235, 2023) makes the point directly: ADHD can mimic anxiety disorders, and the two can also sit side by side.
Who gets which label first matters too. The NHS notes that ADHD is thought to be recognised less often in girls, partly because the inattentive type is quieter and harder to spot, while GAD is more common in women. A woman who arrives at her GP exhausted, worried and unable to focus is, understandably, more likely to be offered an anxiety explanation. Sometimes that’s right. Sometimes it’s only half the story.
ADHD vs anxiety: the differences side by side
Use this table as a rough map, not a test. Real people don’t tick one column neatly, and many tick both.
| Feature | ADHD | Anxiety (such as GAD) |
|---|---|---|
| Onset | Starts in childhood; the NHS says symptoms usually begin before age 12 | Can start at any age, often after a stressful period or life change |
| When focus fails | Even when you’re calm; worse on dull tasks, better under pressure or real interest | Mainly when worry is active; usually improves when the worry settles |
| What the mind does | Hops between topics, drifts, gets pulled by distractions | Loops on one feared outcome, the “what if” spiral |
| Restlessness | A need to move; feeling driven or unable to settle | Feeling tense and on edge, braced for something bad |
| Organisation and time | Long-standing: lost items, missed deadlines, many projects started and few finished | Slips tied to stress periods; perfectionism and over-checking are more typical |
| Impulsivity | Acting or speaking before thinking; interrupting; impulsive spending | Usually cautious; more likely to hold back or seek reassurance |
| Sleep | Mind won’t switch off, often a late body clock | Difficulty falling or staying asleep because of worry |
| Body | Not a core feature | Palpitations, dizziness, stomach upset, muscle tension |
| Emotions | Quick, intense frustration that tends to pass fast | Persistent worry or dread that lingers |
| Avoidance | Avoids tasks that are boring, long or hard to start | Avoids situations that feel threatening |
The single most useful line to remember: in ADHD the attention problem is the starting point. In anxiety, worry is the starting point and the attention problem follows.
Six questions a psychiatrist asks to tell them apart
No scan or blood test settles this. The answer comes from how the story fits together, which is why a good assessment feels more like a careful conversation than an exam. These are the questions that do most of the work.
- When did this start? For ADHD the history matters more than anything else. A clinician will ask about primary school, reports, teachers’ comments and what your parents remember. If you’ve always struggled to stay on task, ADHD stays on the table. If everything was fine until a bereavement, a job change or a burnout at 31, anxiety moves up the list.
- Does it happen when you’re relaxed? Think about a holiday, a weekend, or a project you love. If your focus returns once the pressure lifts, worry is probably the engine. If you still lose track of conversations and misplace things on a quiet Sunday, that points the other way.
- What is in your head when your attention goes? People with anxiety usually report a specific worry occupying the space. People with ADHD more often describe drifting, tangents, or simply not noticing that time has passed.
- Is it everywhere, or only in certain places? ADHD symptoms should appear in more than one setting, such as home, work or education, and relationships. Anxiety is often more tied to particular situations: presentations, meetings, social events.
- What does your body do? Pounding heart, tight chest, churning stomach and dizziness are classic anxiety features, and the NHS lists them for GAD. They aren’t part of the core picture of ADHD, though they can show up if the two coexist.
- What else is going on? Poor sleep, low mood, trauma, alcohol, cannabis, a lot of caffeine, certain medicines and physical health problems can all disturb concentration. A thorough assessment screens for these rather than assuming the answer. If you suspect something else is in the mix, it may help to read about depression, PTSD, OCD or insomnia, all of which can look like ADHD or anxiety on the surface.
What a UK assessment looks like
In England, the benchmark for adult and child ADHD is NICE guideline NG87. It expects the diagnosis to come from an appropriately qualified specialist after a full clinical and psychosocial assessment, including developmental and psychiatric history and a mental state examination. It also says the decision should not rest on rating scales or observation data alone. Questionnaires help; they don’t decide.
For anxiety, the NHS describes GAD as worry about a range of things that affects daily life, is hard to control, and has been present on most days for at least six months. First-line treatment is usually talking therapy, particularly CBT, with an SSRI antidepressant as the common medication option. That stepped approach comes from NICE guideline CG113.
A consultant-led assessment keeps both questions open at the same time. In practice the appointment usually moves through the same stages:
- Questionnaires completed before you meet, covering symptoms, medical history and day-to-day difficulties.
- A clinical interview about what brought you in and what you notice most.
- A developmental history: school years, early behaviour, when things first felt harder than they should.
- A look at work or study, relationships, money, home life and sleep.
- A mental and physical health review, including mood, anxiety, trauma, alcohol, drugs and current medication.
- A formulation that weighs ADHD, anxiety, both, or something else, followed by a clear outcome and a plan.
At the time of writing, Prof. Ahmed El-Missiry offers a private ADHD assessment in London and online across the UK at £370 for a 45 to 50 minute remote consultation, and a dedicated anxiety assessment with a consultant psychiatrist at £250. A computerised attention test is available at £470 as an extra, but it cannot diagnose ADHD on its own and is always read alongside the clinical interview. If you’re not sure which route fits, a wider consultation with a private psychiatrist in London is a sensible place to begin.
When it’s both: how common is it, and what gets treated first?
Having both is far from unusual, and the research is consistent on that even where the exact percentages differ.
- A 2026 meta-analysis of 58 studies and almost 19,000 adults found anxiety scores were clearly higher in adults with ADHD than in those without, a moderate-to-large effect.
- A Frontiers in Psychiatry review reports that roughly half of adults with ADHD in several large studies also had an anxiety disorder; other estimates sit nearer a quarter to a third.
- A Canadian population study found that around one in nine adults with lifetime GAD also had ADHD, against about one in 33 among those without GAD.
So when someone asks “is it ADHD or anxiety?”, the honest clinical answer is sometimes “yes”. The more useful question is which one is causing the most trouble right now, and which should be dealt with first.
A widely cited review of adult ADHD and coexisting conditions (this peer-reviewed review) notes that guidelines generally advise treating the most impairing condition first. The Royal College’s CR235 report discusses the same idea for anxiety: where a clear anxiety disorder is present, treating it and then re-evaluating the ADHD symptoms can give a more accurate picture. Medication choice also needs thought, because some ADHD medicines can heighten anxiety in some people. That’s one reason a prescriber who understands the whole picture matters.
Why getting it wrong matters
The label isn’t academic, because treatment follows it.
If ADHD is mistaken for anxiety, you may be offered anxiety treatment that takes the edge off the worry while leaving the forgetfulness, disorganisation and poor time sense exactly where they were. Years can pass this way. You get told you’re “just anxious”, you try harder, and the real problem stays unnamed.
If anxiety is mistaken for ADHD, the risk runs the other way. Stimulant-type ADHD medication can increase physical arousal in some people, which for an already anxious person may mean more jitteriness, tighter sleep and a faster resting heart rate without any real gain in focus.
Neither mistake is a disaster if it’s caught, and a good follow-up plan builds in review. But it explains why a careful first assessment, with the time to separate the threads, saves a lot of frustration later.
If you ever feel unsafe or are thinking about harming yourself, don’t wait for an appointment. Call 999 in an emergency, contact the Samaritans free on 116 123, or use the NHS urgent mental health help page. The NHS notes that people with ADHD are more likely to experience anxiety and depression, so reaching out early is sensible, not dramatic.
Getting assessed in the UK: NHS, Right to Choose or private
Your route depends on where you live, how long you can wait and what you want from the appointment.
Anxiety. If you’re 18 or over, the NHS says you can refer yourself to an NHS Talking Therapies service without seeing a GP first. A GP can also assess you, usually suggesting talking therapy before medication or specialist referral.
ADHD on the NHS. You normally start with your GP. NHS waits for adult assessment vary hugely by area and are measured in years in many places, and some services have closed their lists altogether.
Right to Choose (England only). The NHS explains that you can ask your GP to refer you to any clinic, including a private one, that provides NHS-funded ADHD services in England. Right to Choose doesn’t apply in Scotland, Wales or Northern Ireland. It’s free to you but is under real pressure: in October 2026 one provider was quoting 20 to 24 weeks for an adult assessment, another was not booking new appointments until extra funding is confirmed, and several local integrated care boards have capped activity. Check current lead times before you ask your GP to refer. Ask too about medication: GP prescribing generally depends on a shared-care agreement with the specialist.
Private assessment. The trade-off is cost against speed and continuity. Prof. El-Missiry sees patients at clinics in Harley Street, Marylebone and Finsbury Park, which suits central, west and north London, and runs secure video consultations for anyone in England, Scotland, Wales or Northern Ireland. Recognised insurers include Aviva, AXA Health, Bupa UK, Vitality, WPA and others (pre-authorisation needed), and Klarna instalments are available for eligible appointments. You can find the full list on the ADHD assessment page.
Whichever route you take, bring the same things: any school reports you can find, a family member’s view of how you were as a child, a list of current medication, and an honest note of your sleep, caffeine and alcohol habits. Those details often settle the question.
Frequently asked questions
Can you have ADHD and anxiety at the same time?
Yes, and it’s common. Studies suggest somewhere between a quarter and a half of adults with ADHD also have an anxiety disorder. A proper assessment looks for both rather than choosing one, then decides which needs attention first.
Can anxiety be mistaken for ADHD?
Yes. Worry eats up concentration and sleep, which can look like inattention. The clues are timing and history: anxiety-related focus problems tend to follow stress and ease when it lifts, while ADHD has usually been present since childhood.
Does ADHD cause anxiety?
It can contribute. Years of missed deadlines, forgotten commitments and feeling “behind” wear people down, and many develop real anxiety as a result. Anxiety disorders can also arise independently in someone with ADHD.
How does a psychiatrist tell the difference?
By taking a detailed history rather than relying on a single test. That means childhood symptoms, how things look when you’re calm, what your thoughts are doing when focus drops, physical symptoms, and whether sleep, mood, substances or other health issues are involved.
Is there a test that settles it?
No single test does. Questionnaires and computerised attention tasks can add information, but NICE guidance says an ADHD diagnosis should not rest on rating scales or observational data alone. The clinical interview carries the weight.
Can I be assessed for ADHD and anxiety in the same appointment?
Often the picture is mixed, so a psychiatrist will screen for both whichever you came in for. If the first appointment raises further questions, a follow-up may be recommended. You can start with either the ADHD assessment or the anxiety assessment.
Can ADHD be diagnosed online in the UK?
In many cases, yes, when the clinical circumstances allow it and a qualified specialist carries out a full assessment. More complex presentations may be better assessed in person. Check that the clinician is a GMC-registered doctor with relevant experience.
How much does a private ADHD or anxiety assessment cost in London?
Fees vary by clinic. At Prof. El-Missiry’s practice, as published in October 2026, an ADHD assessment is £370 and an anxiety assessment is £250. Other UK providers charge more or less, so compare what is included, particularly follow-up and any report.
What should I do if I think it’s both?
Say so at the start of your appointment, and bring examples from childhood and from the last few months. Clinicians can only separate the threads if they hear both stories.
What to do next
If your difficulties go back to childhood and persist even when life is calm, ADHD deserves a proper look: start with a private ADHD assessment in London or online. If worry, tension and physical symptoms lead the picture, and attention suffers when you’re anxious, begin with an anxiety assessment. If you honestly can’t tell, or you suspect mood, trauma, sleep or something else, book a general consultation through the home page of Prof. Ahmed El-Missiry and say so at the start. Bookings are via the online appointment portal, or call +44 800 970 8017.
About the author
Prof. Ahmed El-Missiry is a Consultant Psychiatrist and Professor of Psychiatry, registered with the General Medical Council (GMC 06032945). He assesses adults and adolescents for ADHD, anxiety and other conditions from London clinics and online across the UK. Read more about Prof. El-Missiry.
Medical information note: this article is for general education and is not a substitute for assessment or personal medical advice. Last updated 2 October 2026.
Sources
- NHS: Generalised anxiety disorder (GAD)
- NHS: ADHD in children and young people
- NICE: NG87, ADHD: diagnosis and management
- NICE: CG113, Generalised anxiety disorder and panic disorder in adults
- Royal College of Psychiatrists: CR235, ADHD in adults: good practice guidance (2023)
- Meta-analysis: Symptoms of anxiety in adults with ADHD
- Review: Comorbid anxiety and depression in adults with ADHD, Frontiers in Psychiatry
- Study: Generalized anxiety disorder among adults with ADHD
- Review: Adult ADHD and comorbid disorders
- Provider waiting-time pages, October 2026: Psychiatry UK, Clinical Partners
