ADHD and anxiety are confused in both directions because their most visible features are the same ones. Difficulty concentrating, restlessness, broken sleep and a short fuse belong to each of them.
No symptom list separates them, which is why comparing symptom lists is the wrong exercise. What separates them is timing and mechanism.
The question that actually distinguishes them
When did it start, and what does it move with?
ADHD is developmental. The difficulties are present in childhood, and while their consequences change as life gets less structured, the underlying pattern is broadly constant. It does not arrive in your twenties, and it does not lift when a stressful project ends.
Anxiety more often has an onset you can locate, and it moves with circumstances. It rises during a bad period and eases when the period does.
So the useful question at an assessment is not “do you find it hard to concentrate”, which is a yes for almost everyone in either group. It is whether you found it hard to concentrate in primary school, on a normal Tuesday, when nothing in particular was wrong. The ADHD hub covers what assessment involves and what evidence it asks for.
Same experience, different mechanism
Look closely at the attention itself and the two come apart.
In anxiety, attention is captured. It is not that you cannot focus, it is that focus keeps being pulled to one specific thing. The worry has content, it is repetitive, and it is about something.
In ADHD, attention is unanchored. It does not stay anywhere, including on the worry. This is why people with ADHD often describe drifting away from things they actively care about, which anxiety does not usually do.
The same distinction applies to restlessness. Anxious restlessness is keyed-up and apprehensive, a body braced for something. ADHD restlessness is a need to move that carries no threat with it and has been there since childhood.
A schematic of the distinction described in this article and in the sources cited. Not measured data, and it does not replace an assessment.
Nothing here is diagnostic on its own. The point is that the discriminating questions are about history and pattern, not about how bad the concentration is.
Both errors are expensive
Reading ADHD as anxiety is the commoner direction, particularly in adults who have compensated well. It produces a specific signature: treatment that helps genuinely but partially, repeated across several courses, with the residual difficulty attributed to not having tried hard enough. Our guide to ADHD in women covers why that route is so well worn.
Reading anxiety as ADHD happens too, and it has become easier as the language has spread. Someone whose concentration collapsed during a genuinely difficult year can recognise every description of inattention, because the description fits. What is missing is the childhood history, and an assessment is where that gets established.
The other comparison people arrive at from here is ADHD and bipolar disorder, which turns on timescale rather than on symptoms. Two neighbouring articles cover patterns that get pulled into this comparison and are separate questions: ADHD overstimulation covers sensory and cognitive overload, and OCD and ADHD covers a different overlap with its own confusions.
Which pattern does yours match?
Tick anything true. This is a reflection prompt rather than a test, it produces no diagnosis, and only an assessment can.
0 of 8 ticked
The first three and the seventh point one way; the fourth, fifth and eighth point the other. Ticking items in both groups is the ordinary case rather than a contradiction, because having both is common. The sixth is the single most useful thing to say out loud at an appointment, since partial improvement that stalls is what most often gets misread as the treatment failing.
Occasional poor concentration is ordinary and belongs to neither diagnosis. What makes it worth raising is a lifelong pattern, or a clear change from your own baseline, that is costing you across more than one part of life.
Nothing here matched. If the difficulty is being overwhelmed by noise and input rather than by worry, our guide to ADHD overstimulation covers that instead.
The free anxiety screener uses the GAD-7 and measures anxiety over the past fortnight. It cannot tell you anything about ADHD, and no screener on this site assesses ADHD, deliberately: that needs a clinical assessment rather than a questionnaire.
Why the distinction changes the treatment
Getting this right is not a labelling exercise, because the two pathways diverge.
Anxiety disorders are treated with cognitive behavioural therapy aimed at worry and avoidance, and sometimes with medication. None of that addresses a lifelong attention difficulty, which is why a person with undiagnosed ADHD can complete a good course of therapy and be left with most of the original problem.
ADHD assessment and management follow a separate pathway with its own guidance, including when medication is appropriate and what should sit alongside it. [nice-ng87-adhd-anxiety]
Where both are present, and mood and anxiety disorders are among the most frequent conditions occurring alongside adult ADHD, guidance is that the most impairing condition is generally treated first. [katzman-2017-adhd-comorbid] That is a clinical judgement rather than a rule you can apply to yourself, and it is a reasonable thing to ask about directly.
When to seek help
See a doctor if concentration, restlessness or worry are costing you at work, at home or in relationships, and take specific examples rather than a label.
Say when it started, whether it was present in childhood, and whether it is there when life is going well. Those three answers do more to direct a referral than any description of how bad it currently is.
If you have already been treated for anxiety and improvement stalled, say that explicitly. It is the detail most likely to prompt an ADHD referral, and it is the one people most often leave out because it sounds like a complaint about the treatment.
Go urgently if you are having thoughts of harming yourself.
How MyFreud can help
The question that separates these two is about pattern over time, and pattern over time is exactly what nobody can reconstruct accurately from memory. MyFreud gives you daily mood tracking that takes seconds, so what you bring to an appointment is a record rather than an impression.
Download MyFreud and start today: App Store or Google Play.