ADHD or anxiety? How to tell the difference

The short answer

ADHD and anxiety are different things that can feel almost identical from the inside. Both can leave you restless, unable to concentrate, short-tempered and awake at three in the morning. Both can make you avoid work you fully intend to do.

The difference is usually in your history and in what the difficulty is attached to. ADHD is neurodevelopmental, so it reaches back to childhood and shows up across most areas of life. An anxiety condition often has more of a starting point, and it tends to be organised around specific fears or a specific period of your life.

Many adults have both, and that is one reason a questionnaire cannot settle it. A clinician can.

What ADHD and anxiety have in common

More than most people expect, which is why one is so often treated for years while the other goes unnamed.

Both can involve difficulty concentrating and holding information in mind. Both can involve physical restlessness and difficulty settling. Both can involve broken sleep, either from lying awake or from waking early. Both can involve irritability, quick anger and tears that seem out of proportion. Both can involve avoiding a task and then feeling worse for avoiding it. Both can produce tension in the body, headaches and stomach trouble.

Both are also frequently missed in women and in adults who have built careful systems that hide the difficulty without removing what it costs them.

Concentration: drifting attention against captured attention

This is the clearest difference to describe, and it is often the question a clinician asks first.

With ADHD, attention drifts to whatever is most stimulating. It goes to the noise outside, to your phone, to a thought about something unrelated. Ask someone with ADHD what they were thinking about instead of the report and they often cannot say, because it was four different things.

With anxiety, attention is usually captured rather than drifting. It goes to the worry, and it keeps going back there. Ask the same question and the answer is specific: the conversation with your manager, the health worry, the email you have not answered. The content of the distraction is consistent.

Where both are present, people often describe drifting attention that then lands on a worry and gets stuck there.

Restlessness: physical against apprehensive

ADHD restlessness tends to be physical and it is present even when nothing is wrong. It shows up on a good day, on holiday, on a comfortable sofa in front of a film you chose. People describe needing to move a leg, to stand up or to be doing something else at the same time, while feeling perfectly content.

Anxious restlessness usually arrives with a sense of apprehension attached, and it eases when the feared thing passes. It is less likely to be there on a genuinely calm day with nothing pending.

A clinician will ask when the restlessness is absent, because the answer is informative. Restlessness that is never absent points in a different direction from restlessness that comes and goes with events.

Avoidance: starting against outcomes

Both ADHD and anxiety produce avoidance, and the reason differs.

ADHD avoidance is usually about starting. The task is not frightening, it is unstartable. You know what to do, you want it done and the first step does not happen until the deadline is close enough to create urgency. Many people with ADHD describe pressure as the thing that finally makes work possible.

Anxious avoidance is usually about the outcome. The task is avoided because of what might happen: the criticism, the mistake, the confrontation, the result. Pressure tends to make it harder rather than easier.

That question of whether a deadline helps or hinders is often revealing, though it is one detail among many rather than a test.

History and onset

ADHD is present from childhood, so a clinician looks for signs that reach back that far and appear across settings: home, school, friendships and later work. School reports, family memories and the account of someone who knew you then are all useful evidence.

Anxiety can begin at any age, and it often relates to circumstances, health, a period of stress or a specific situation. Difficulties that appeared only in the last couple of years, or that exist only in one part of your life, point away from ADHD and towards something else, which might be anxiety, sleep, burnout or the demands of your current life.

This is also why the same person can be told different things by different services. A service that only asks about the present will find anxiety. Whether ADHD sits underneath it is a separate question that requires a developmental history.

The two often occur together

Anxiety and ADHD commonly appear in the same person, and having one does not protect you from the other.

Many adults describe years of unrecognised ADHD as anxiety-producing in itself: missed deadlines, lost items, being late, being told you are careless and waiting for the next thing to go wrong. Anxiety that develops in that context is a real anxiety condition and it deserves treating. It also does not explain the ADHD.

Our clinicians are experienced in co-occurring presentations including anxiety and depression, and an assessment considers them rather than stopping at the first plausible answer. If your difficulties turn out to be better explained by anxiety, stress or sleep, we say so in writing.

Why only an assessment can separate them

Because the two conditions overlap in symptoms and differ in history, and only one of those can be recovered from a structured clinical interview.

An adult ADHD assessment with us uses DIVA-5, a structured diagnostic interview, alongside validated questionnaires and input from someone who knows you well. It is mapped to DSM-5-TR and ICD-11 in line with NICE guidelines, and the outcome is reviewed by a team of two to three practitioners with psychiatrist approval.

A screening questionnaire cannot make that distinction. What it can do is tell you whether the question is worth taking further, and that is a reasonable place to start.

What to do next

Start with the free ASRS below, the World Health Organisation's adult ADHD self-report screener. It takes a few minutes and it is a screener rather than a diagnosis.

Then book the free pre-assessment evaluation. It costs nothing and it is the point at which a clinician can look at the whole shape of what you are experiencing rather than one part of it. An adult ADHD assessment is €595 in Ireland and £500 in the UK, online, with no GP referral required and your NICE-compliant report, accepted by the HSE and the NHS, within 6 weeks of your first appointment. If autistic traits are also in the picture, the combined ADHD and autism assessment is €1,000 in Ireland and £1,000 in the UK.

Common questions

Can anxiety look like ADHD?

Yes, and it often does. Anxiety can produce poor concentration, restlessness, disturbed sleep, irritability and avoidance, all of which appear in ADHD as well. The distinction comes from your developmental history, whether the difficulties appear across most areas of life and what the attention is doing when it goes: drifting to anything or returning to a specific worry.

Can I have both ADHD and anxiety?

Yes. The two commonly occur together, and one diagnosis does not rule out the other. Our clinicians are experienced in co-occurring presentations including anxiety and depression, and an assessment considers them rather than stopping at the first explanation that fits.

I am already being treated for anxiety but I still cannot focus. What does that mean?

It means the question is worth asking, and it does not answer it on its own. Some people find that their remaining difficulties are explained by ADHD that was never assessed. Others find the explanation is something else, including sleep, stress or the demands of their current life. Keep working with whoever is treating your anxiety, and book a free pre-assessment evaluation to look at the rest.

Does the ASRS diagnose ADHD?

No. The ASRS is a screener. It indicates whether a full assessment is worth pursuing and it cannot diagnose ADHD, rule it out or distinguish it from anxiety. A diagnosis requires a structured clinical interview such as DIVA-5, a developmental history and informant input, reviewed by qualified clinicians.

Will an ADHD assessment look at my anxiety too?

Yes. A thorough assessment covers physical and mental health, sleep, emotional regulation and your current circumstances, because those are exactly the things that can explain attention difficulties or occur alongside ADHD. Your written report sets out the outcome either way, so you leave with an answer rather than another question.