ADHD or anxiety, or both? Why they get so tangled

Here’s a common story. Someone spends years struggling with concentration, overwhelm and a mind that won’t sit still. They see a GP, reasonably get diagnosed with anxiety, try treatment, maybe therapy or maybe medication, and it helps a bit. But the concentration problems don’t move. The overwhelm keeps regenerating. Eventually somebody asks about their childhood, and the story starts over.

Anxiety and ADHD are genuinely difficult to tell apart from the inside, for good reasons.

The symptoms overlap almost perfectly on the surface. Both can involve poor concentration, restlessness, racing thoughts, procrastination, sleep problems, irritability and a pervasive sense of being behind. A checklist of this-moment symptoms often can’t distinguish them, which is one reason quick screenings mislead in both directions.

They co-occur constantly. Around 47% of adults with ADHD also meet criteria for an anxiety disorder (Kessler et al., 2006). So this isn’t only a differential-diagnosis question. Very often the accurate answer is both, and treatment needs to account for both.

Anxiety can be a symptom of unrecognised ADHD. This is the part that surprises people. If your working memory drops things, your time perception is unreliable and deadlines ambush you, then chronic vigilance is a rational adaptation. Checking everything four times, rehearsing conversations, holding your whole to-do list in a state of low-grade dread, that is anxiety, and it’s also functioning as an external hard drive for an executive system that keeps losing data. Treat the anxiety without noticing the ADHD and you’re often asking someone to give up their only backup system.

ADHD can also be a consequence-generator for anxiety. Decades of missed deadlines, forgotten commitments and public organisational failures teach a person that disaster is always one lapse away. That’s not a distorted cognition to be gently restructured. It’s accurate pattern recognition from lived data. It just has a treatable cause.

So how does assessment actually tell them apart? A few of the questions that do real work:

When did it start? ADHD is neurodevelopmental, so the pattern is lifelong, visible (in retrospect, at least) from childhood, even if well masked. Anxiety more often has an onset, a period when things changed, though early-onset anxiety exists too. This is why a proper assessment spends real time on developmental history rather than only current symptoms.

What happens when you’re calm? Anxiety-driven concentration problems tend to ease when the worry eases: on holiday, in safe company, when the stressor resolves. ADHD attention problems persist in calm conditions: relaxed, motivated, genuinely interested in doing the tax return, and still unable to start it.

What is the distraction made of? Anxious minds are typically pulled toward threat: worries, what-ifs, replayed conversations. ADHD minds are pulled toward anything: interesting, novel, shiny, irrelevant. Plenty of people report both channels, which is again informative.

What has treatment done so far? A history of partial response to anxiety treatment, feeling calmer but no more functional, is a common flag in adult ADHD assessment, especially for women, who are disproportionately likely to have collected anxiety and depression diagnoses first (Young et al., 2020).

None of these questions is decisive alone, which is the point: there is no single test for either condition, and good assessment triangulates developmental history, current functioning across settings, standardised measures and a careful screen for everything else that could explain the picture: depression, trauma, sleep, thyroid, life.

Why does getting it right matter? Because the treatments differ. Anxiety treatment aims (broadly) at recalibrating threat responses; ADHD support aims at attention, structure and executive load, through adapted therapy, environmental design, and for some people medication via a psychiatrist. If both are present, sequencing matters, and a formulation that sees the whole system usually beats treating each label in isolation.

If this tangle sounds like your last decade, an assessment that takes the question seriously, rather than defaulting to whichever diagnosis is nearest, is worth having. Our adult ADHD page covers what ADHD actually involves, and our screening service exists precisely for the “is this worth a full assessment?” stage. Questions first? Contact us.