You can’t focus. Your mind races at night. You forget things, miss deadlines, feel constantly on edge. You’ve been in treatment for anxiety for years — maybe on medication, maybe in therapy, maybe both — and while things have gotten somewhat better, there’s still something that doesn’t quite fit. The anxiety treatment helps, but it doesn’t explain everything. It doesn’t explain all of it.
There’s a reason for that. And it has a name.
ADHD and anxiety are two of the most commonly confused conditions in mental health — not because clinicians are careless, but because they genuinely look alike. They share symptoms that are nearly identical on the surface. They co-occur in the same person more often than not. And in adults — particularly women — ADHD has historically been so underidentified that anxiety has often been treated as the primary diagnosis when it was actually a secondary one, produced by years of unaddressed neurological struggle.
Getting the diagnosis right isn’t an academic exercise. It determines what treatment works. And that difference matters enormously.
The Symptoms That Overlap — and Why They Trip Everyone Up
Both ADHD and anxiety can produce difficulty concentrating, restlessness, sleep problems, forgetfulness, and emotional reactivity. Seen on a checklist, they are nearly indistinguishable. A clinician seeing either condition in isolation might reasonably reach for either diagnosis.
What makes the overlap especially tricky is that the mechanisms behind the same symptom are completely different in each condition.
Take difficulty concentrating. In ADHD, attention fluctuates based on interest and stimulation — the brain is easily distracted even when a person is otherwise calm, and hyperfocuses when engaged with something compelling. In anxiety, attention is consistently pulled toward perceived threats — the brain is busy scanning for danger, processing worry, and cannot disengage from fear signals long enough to attend to anything else. The person in both cases cannot focus. But why they cannot focus is entirely different, and treating one as the other produces the wrong outcome.
The same pattern holds for restlessness. ADHD restlessness is neurological — a need for stimulation and movement that exists independent of any emotional content. Anxiety restlessness is driven by the nervous system’s threat response — the body is preparing to act against a danger that isn’t actually there. Identical presentation, different engine.
The Critical Clinical Distinction
The clearest way to tell ADHD from anxiety — when both are candidates — comes down to one question: does the difficulty happen when the person is calm, or only when worry is present?
Adults with ADHD struggle to focus even when calm. Their minds wander not because they’re afraid of something but because attention regulation is neurologically impaired regardless of emotional state. An ADHD brain in a quiet room with nothing to worry about will still drift.
Adults with anxiety struggle to focus because they’re distracted by worries and fears. When the anxiety resolves — on a relaxed vacation, after a problem is solved, during a genuinely absorbing activity — the focus problems often improve significantly.
ADHD also has a lifespan requirement: symptoms must have been present since childhood, even if they went unrecognized. A person who functioned well until their late twenties and then developed attention problems following a period of significant stress is more likely experiencing anxiety-driven attention difficulties than ADHD. Anxiety, by contrast, can emerge at any point in life in response to stress, trauma, or life transitions.
The Complication: Most People Have Both
Here is where the clinical picture gets genuinely complicated, and where a thorough evaluation becomes non-negotiable rather than optional.
Research consistently shows that up to 50% of adults with ADHD also experience anxiety at some point in their lives. Studies of adults presenting to anxiety clinics have found that roughly 28-32% also meet criteria for ADHD — and of those, fewer than 17% had ever received ADHD treatment. In other words, the anxiety was being treated. The ADHD underneath it was invisible.
This matters enormously because anxiety and ADHD can produce and amplify each other in a closed loop. ADHD causes executive function failures — missed deadlines, forgotten commitments, chronic disorganization. Those failures cause real-world consequences: strained relationships, professional setbacks, financial chaos. Those consequences generate anxiety. The anxiety makes the ADHD symptoms worse. The worsened ADHD creates more failures, which generates more anxiety.
When a clinician treats only the anxiety without identifying the ADHD underneath it, the loop continues. The medication dampens the acute anxiety somewhat, but the source of the anxiety — the neurological difficulty that keeps producing the failures that keep producing the stress — is never addressed. The treatment helps, but it never quite resolves things. Sound familiar?
There is also a specific clinical distinction worth knowing: ADHD-related worry tends to be connected to executive function domains — finances, health, relationships, school, work. Generalized anxiety, by contrast, is more global and pervasive, with worry that is disproportionate to actual stressors and difficult to control even when nothing has gone wrong.
Why This Is One of the Most Common Misdiagnosis Patterns in Adults
Research published in peer-reviewed psychiatric journals is unambiguous: ADHD is a vastly under-detected condition among adults presenting with anxiety, and the overlapping symptoms are a central reason why. Clinicians treating anxiety don’t always look behind it for ADHD. When a patient presents with concentration difficulties and worry, anxiety is the more familiar framework — and it fits well enough that ADHD is never considered.
This pattern is especially pronounced in women. Girls and women with ADHD are more likely to present with inattentive symptoms rather than hyperactivity, and more likely to have significant co-occurring anxiety. The anxiety gets treated. The inattentive ADHD, which doesn’t disrupt classrooms or meetings, stays invisible. Many women spend years or decades in anxiety treatment before an ADHD evaluation finally explains why the anxiety treatment never fully worked.
Secondary anxiety — anxiety that results specifically from the daily strain of unaddressed ADHD — is clinically distinct from primary anxiety, but requires identifying the ADHD to recognize it. A person who is exhausted from working twice as hard as everyone around them to manage basic life tasks, who is chronically behind and chronically ashamed of being chronically behind, is not experiencing primary generalized anxiety. They are experiencing the predictable emotional result of an unidentified neurological condition that has never been addressed.
Why a Thorough Evaluation — Not Just an Anxiety Assessment — Is the Only Way to Know
Self-report cannot reliably distinguish ADHD from anxiety, and neither can a single brief screening. The overlap between the two conditions is precisely why a comprehensive evaluation that specifically assesses both is so important.
At Poconos ADHD Assessments, every evaluation includes validated screening instruments for both anxiety and ADHD alongside the DIVA-5 clinical interview — specifically because this diagnostic picture is so commonly complicated by co-occurrence. The evaluation doesn’t just ask whether ADHD is present. It asks what else is present, how the pieces relate to each other, and what the clinical picture looks like when the whole landscape is mapped rather than just one corner of it.
For someone who has been in anxiety treatment for years without full resolution, an evaluation that specifically looks at both conditions — using validated T-scored instruments for anxiety and a gold-standard structured interview for ADHD — often produces the most clarifying clinical picture they’ve ever had. Not because the anxiety diagnosis was wrong, exactly. But because it was incomplete.
The result is a 12–20 page written report that documents what was found, explains how the conditions relate to each other in your specific clinical picture, and gives your prescriber and other providers the detailed foundation they need to design treatment that actually addresses the full picture.
Most reports are delivered within 14 business days of the initial consult. No referral required. Available via Zoom across Pennsylvania.
If You’ve Been Treating Anxiety for Years and Something Still Doesn’t Fit
Pay attention to that feeling. It may be the most clinically important data point you have.
The gap between “somewhat better” and “actually better” — between anxiety treatment that helps but never quite resolves, and the full picture of what’s driving your experience — is often where ADHD lives. An evaluation that specifically looks for it, using tools built to find it, is the only way to know for certain.
And knowing for certain changes everything. What you do next. What you ask your prescriber. What you stop blaming yourself for.
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Dawn Friedman, MSEd, LPC — Poconos ADHD Assessments. Serving Pike County, Monroe County, Wayne County, Lackawanna County, and all of NEPA via Zoom. Most reports in 14 business days.
This article is for informational purposes only and does not constitute medical advice. Diagnosis and treatment decisions should be made in partnership with your licensed clinical and medical providers.