ADHD or anxiety — how do you tell the difference

Maybe you've been living with racing thoughts and a persistent sense that your brain doesn't work quite the way everyone else's does. Maybe you can't seem to focus — or you focus intensely on the wrong things at the wrong times. Maybe you're exhausted from trying so hard to keep up, and some combination of anxiety and attention trouble has followed you through school, work, and relationships for as long as you can remember.

And now you're wondering: Is this anxiety? Is it ADHD? Could it be both?

These are some of the most common questions I hear — and they deserve a real answer, not just a shrug and a referral form. So let's get into it.

Why this question is so hard to answer

ADHD (attention-deficit/hyperactivity disorder) and anxiety disorders are two of the most prevalent mental health conditions in adults — and they look remarkably similar on the surface. Both can cause:

• Difficulty concentrating or completing tasks

• Restlessness and difficulty sitting still

• Sleep problems

• Irritability

• A sense of overwhelm or feeling constantly behind

So it's understandable that people — and even clinicians — sometimes mistake one for the other. Research shows that adults with ADHD are frequently diagnosed with anxiety or depression before their ADHD is ever identified, which can delay the right support by years.

But while the surface symptoms overlap, what's driving them is quite different.

And that distinction matters enormously for treatment.

The key question: what's underneath the symptom?

Here's a way to think about it that I find genuinely useful in clinical conversations:

With anxiety, attention problems are usually driven by worry. The mind is consumed by a threat — real or imagined — and everything else competes with that. When the anxiety quiets down, attention often improves.

With ADHD, attention problems happen in all directions, even when a person is calm. It's not that the brain is preoccupied with something else — it's that regulating attention itself is the challenge, regardless of emotional state.

What looks like ADHD can sometimes turn out to be driven primarily by anxiety. But more often, the reverse is true — anxiety turns out to be the tip of the iceberg, with undiagnosed ADHD underneath it. Years of struggling to function with an impaired executive system — the part of the brain that manages planning, organization, and impulse control — creates its own anxiety as a secondary consequence.

That has a name and it is secondary anxiety: It's what happens when a person has had to work ten times harder than everyone else just to get through ordinary days, and has accumulated years of shame, near-misses, and exhausting effort. This is a very different beast than a primary anxiety disorder.

How ADHD and anxiety actually differ

Here's a more clinical breakdown, because the details matter:

Onset: ADHD symptoms begin in childhood, even if they go unrecognized for decades. Anxiety disorders can emerge at any point, often triggered by life stress or significant transitions.

Consistency: ADHD symptoms are present across settings — at work, at home, in relationships, and in situations with no obvious stressor. Anxiety symptoms are often more contextual and tied to more specific fears or worries.

The worry itself: With generalized anxiety, worry tends to be broad and pervasive — hard to pin down to a specific cause, hard to switch off, disproportionate to the actual stressor. (Some anxiety disorders, i.e. phobias, are more specific but are differ in content from the worry of ADHD.) ADHD-related worry is often more specific: missed deadlines, forgotten tasks, relationships strained by inattention. The content is concrete, even if the frequency is high.

Downtime: When an anxious person has nothing to worry about, they often feel relief. When someone with an anxiety disorder has no clear reason to feel anxious, they may remain in that sense of doom or dread, but can usually identify that they can't see why they feel that way. On the other hand, when someone with ADHD has nothing to do, they often feel restless, bored, or agitated — that difficulty doing nothing is built in.

Response to structure: While some people with ADHD find themselves resisting or resenting external structure, they also often find that clear structure, external deadlines, and high-stakes situations actually improve their focus (a phenomenon called hyperfocus). Anxiety typically makes performance in high-pressure situations worse.

The comorbidity piece — because it's common

Here's something that complicates the picture further: ADHD and anxiety frequently occur together. Research indicates that between 25% and 50% of adults with ADHD experience an anxiety disorder at some point in their lives. If you have both, neither diagnosis tells the whole story on its own.

When both are present, the symptoms of each can amplify the other. Anxiety can make it even harder to focus, and ADHD-related struggles can feed more anxiety. Treating only one — which happens when one goes undiagnosed — tends to leave people still struggling in ways they can't quite explain.

Some questions worth sitting with

If you're trying to get a clearer sense of what you're dealing with, these aren't diagnostic — only a proper assessment can get you there — but they might help orient you:

• When you have trouble concentrating, is it because your mind is tangled in worry, or because it's just... elsewhere?

• Have attention and organizational struggles been a consistent thread throughout your life, or are they newer and tied to a stressful period?

• Does your restlessness ease when circumstances are calm, or is it always there in some form?

• When you do get interested in something, can you focus intensely — sometimes too intensely?

• Has anyone in your family been diagnosed with ADHD? (ADHD has a significant genetic component.)

What a proper assessment looks like

Because the symptoms overlap so much, and because what's driving them matters so much for treatment, a proper assessment is worth it. A comprehensive evaluation typically involves:

• A detailed clinical interview covering your history — childhood, school, work, relationships

• Standardized rating scales for both ADHD and anxiety

• Ruling out other conditions that can look like either one

• Input from someone who knows you well, when possible

In Ontario, this assessment has historically been expensive and slow — the public system can mean an 18-month wait for a psychiatrist referral, and private psychologist assessments can run $2,500 to $3,500 or more. But there are now more options than most people realize, and this is something I'm well-positioned to help with.

Through the Psychotherapy Matters Virtual Clinic (PMVC) — which I work with — you can access a psychiatrist-led diagnostic assessment alongside your ongoing therapy. The psychiatrist can provide formal diagnosis and medication recommendations; OHIP covers the psychiatrist's fee; and the administrative cost for the assessment component is significantly lower than private alternatives. (You can read more about how PMVC works on my services page.)

Treatment: why the distinction matters

If ADHD is the primary issue, treatment will look different than if anxiety is. And if both are present, a plan that addresses only one tends to produce limited results.

For ADHD, therapy — particularly ACT and CBT adapted for executive functioning — can make a real difference. Skills around planning, time management, emotional regulation, and building external structure are central. Medication is often part of the picture too, which is where a psychiatrist's input becomes important.

For anxiety, ACT and CBT look at the relationship between thoughts, avoidance behaviours, and the things you actually value — building the flexibility to move forward even when anxiety is present.

When both are present, the work often involves untangling which thread to pull first, and then weaving in strategies for both.

You don't have to figure this out alone

One of the most important things I want to say here is: you are not supposed to diagnose yourself. These conditions are genuinely hard to distinguish without a careful clinical picture, and there's no shame in not knowing which one you're dealing with — or both, or something else entirely.

What matters is that you're noticing something is off. That noticing is enough to start.

If you're an Ontario resident and you'd like to explore what's going on — whether through a free consultation call, a discussion about assessment options, or simply figuring out where to start — I'd be glad to help.

Gwen Preston is a Registered Psychotherapist (Qualifying) offering virtual therapy and in-person sessions in Orleans, Ontario. She works with adults and teens across Ontario, with a focus on anxiety, neurodivergence, burnout, and life transitions. Through the Psychotherapy Matters Virtual Clinic (PMVC), she offers access to psychiatrist-led assessments for ADHD and ASD at a fraction of the typical private cost.