M.D. Medical Director, Psychiatrist
Here’s a description. See which condition you’d guess.
Can’t concentrate? Mind won’t settle? Restless in a way that makes sitting through a meeting physically uncomfortable. Sleep is bad — takes an hour to fall asleep because thoughts won’t stop. Irritable with people who don’t deserve it. Chronically overwhelmed by a to-do list that other people seem to handle fine. Exhausted by two in the afternoon.
That’s ADHD. It’s also anxiety. It’s also both, which is the most common answer of all.
This overlap is why adults get treated for the wrong condition for years at a time — and why “I tried therapy for my anxiety and it didn’t really help” is a sentence worth taking seriously rather than repeating the therapy.
Why they look so similar
The symptom lists genuinely intersect. Both conditions can produce:
- Difficulty concentrating and finishing tasks
- Physical restlessness and difficulty sitting still
- Trouble falling asleep
- Irritability and a short fuse
- Feeling overwhelmed by ordinary demands
- Procrastination and avoidance
- Fatigue that sleep doesn’t resolve
Looking at that list and trying to pick a diagnosis is a losing game. The distinction isn’t in the symptoms. It’s in the mechanism underneath them.
If you want the ADHD symptom picture on its own first, our post on 10 signs of adult ADHD covers it, and what to know about ADHD in adults walks through diagnosis and support. This post is about telling it apart from something else.
The question that separates them: why can’t you concentrate?
This is the most useful distinction there is, and most people can answer it about themselves in thirty seconds.
With anxiety, concentration is blocked. You can’t focus because something is occupying the channel — worry about the deadline, the conversation you had yesterday, the thing you might have forgotten. There’s content. If you could switch off the worry, you’d be able to work.
With ADHD, attention drifts. You sit down to work, and twenty minutes later you’re somewhere else entirely with no idea how you got there. There was no worry. Nothing was troubling you. Your attention simply went, the way a dog leaves a yard with an open gate.
The restlessness splits the same way. Anxious restlessness is keyed up — tense, braced, waiting for something. ADHD restlessness is under-stimulated — bored, needing input, drumming your fingers because sitting still is genuinely aversive rather than frightening.
Four more distinctions that hold up
Timeline. ADHD is a neurodevelopmental condition. The symptoms were present in childhood, even if nobody named them — the report card that said “bright but doesn’t apply himself,” the lost homework, the constant sense of being told to focus. Anxiety disorders more often emerge later and are more likely to be tied to a period or a circumstance. “Has this always been true of me, or did it start?” is the single most diagnostically useful question in the whole conversation.
Hyperfocus. This one confuses people badly, because it looks like the opposite of an attention problem. Many adults with ADHD can lock onto something genuinely interesting for six hours and forget to eat. That’s not evidence against ADHD; it’s characteristic of it. ADHD is better described as difficulty regulating attention than as having none — it goes where it wants, not where you send it. Anxiety doesn’t produce this pattern.
What the worry is about. Anxious people worry about outcomes: what might happen, what people think, what could go wrong. Adults with ADHD often worry too, but the content is different and more retrospective — about what they’ve already dropped. The missed email, the forgotten birthday, the bill that went unpaid. If your anxiety is almost entirely about consequences of disorganization, that’s a strong signal.
Response to relief. Take away the stressor — the deadline passes, the project ships — and anxiety typically eases. The ADHD pattern doesn’t. You still lose your keys during the quiet week.
Very often, it’s both
Research consistently finds that roughly half of adults with ADHD also meet criteria for an anxiety disorder. That’s not two unrelated conditions turning up together by chance. There’s a causal path.
Imagine thirty years of missing deadlines, losing things, interrupting people and being told you’re not trying hard enough. A reasonable response is to become vigilant — to check everything three times, to over-prepare, to feel a low hum of dread about what you’ve forgotten. That vigilance is anxiety, and it’s secondary to an unrecognized attention problem.
This is why treating the anxiety alone so often produces partial results. The coping strategies help, and the underlying reason the strategies are necessary doesn’t change. People describe it as managing the symptom while the cause keeps generating new ones.
And sometimes it’s neither
Worth ruling out before anyone concludes anything:
Burnout. Chronic work stress produces genuine concentration problems, exhaustion and irritability. The distinguishing feature is domain and timeline — burnout is usually tied to a situation and tends to lift with real distance from it. ADHD doesn’t improve on sabbatical.
Depression. Concentration problems are a diagnostic criterion for depression. If the attention difficulties arrived alongside low mood, loss of interest and changed sleep or appetite, depression is the more likely explanation. See depression vs. anxiety.
Sleep and medical causes. Untreated sleep apnea, thyroid problems and iron deficiency all impair attention convincingly. These are worth ruling out with your primary care provider, because they’re cheap to test and fixable.
Screen time, dopamine, and attention
Digital overstimulation. High screen time and frequent social media use have been shown to predict elevated depression risk while negatively impacting sustained attention and dysregulating dopamine levels. Minimizing overly stimulating digital processes—such as constant social media scrolling and excessive TV viewing—can help stabilize dopamine pathways and significantly improve mental health and focus.
Nutrition and brain health
Diet and processing. Research shows that ADHD symptoms often worsen with diets high in processed foods and sugar. Conducting a dietary assessment and making supportive nutritional changes are important steps for optimal brain health and symptom management, regardless of whether medication is used.
Why the answer matters practically
It’s tempting to think the label is academic when the symptoms are the problem. It isn’t, for two reasons.
The treatments are different. Anxiety responds well to specific therapeutic approaches and, where indicated, particular medications. ADHD treatment involves different medications and different behavioral strategies — external structure, environmental design, and skills work that assumes the attention system rather than fighting it. Our post on strategies for adults living with ADHD covers that side.
And misdiagnosis has consequences in both directions. Treating ADHD as anxiety means years of working on worry that was always downstream of something else. In the other direction, stimulant medication can worsen anxiety symptoms in some people, which is one of several reasons an accurate diagnosis needs to come before a prescription rather than after.
The late-diagnosis problem
A large number of adults reaching ADHD evaluation for the first time in their thirties, forties or fifties were missed for predictable reasons.
ADHD in girls and women has historically been under-recognized, partly because the inattentive presentation is quieter than the hyperactive one and generates fewer complaints from teachers. Our post on how ADHD affects women goes into this.
The other group routinely missed: people who did well in school. If you were bright enough to compensate, ADHD often doesn’t surface until the external structure disappears — university, a first job with no supervision, a promotion into a role with no fixed tasks, or parenthood. The demands went up and the scaffolding went away at the same time. That’s not a new condition. It’s the same one, finally exceeding your ability to work around it.
What an evaluation actually involves
A real ADHD assessment is not a five-question online quiz.
It’s a structured clinical interview covering your current symptoms and your developmental history, standardized rating scales, a review of school and work patterns, input from someone who has known you a long time where that’s available, and screening for the conditions that mimic or accompany ADHD — anxiety, depression, sleep disorders and medical causes. The point is to arrive at the right answer rather than a plausible one.
Our ADHD testing page explains the process, and our overviews of ADHD and anxiety cover each condition in detail.
BestMind provides ADHD evaluation and psychiatric care across Oregon and Washington, in person and by telehealth. Get in touch or find your nearest location.
If you’ve spent years being treated for the wrong thing, the frustrating part isn’t that the treatment failed. It’s how reasonable the wrong answer looked.
If you are in crisis, call or text 988 to reach the 988 Suicide & Crisis Lifeline, available 24 hours a day.
Frequently Asked Questions
What’s the difference between ADHD and anxiety in adults?
The symptoms overlap heavily, but the mechanism differs. With anxiety, concentration is blocked by worry — there’s identifiable content occupying your attention. With ADHD, attention simply drifts with no worry attached. ADHD also traces back to childhood, while anxiety disorders more often emerge later or attach to a specific period.
Can you have both ADHD and anxiety?
Yes, and it’s common — research consistently finds that roughly half of adults with ADHD also meet criteria for an anxiety disorder. Often the anxiety is secondary: years of missed deadlines and forgotten commitments produce a well-earned vigilance about what you might have dropped.
Why didn’t therapy for my anxiety help?
If an untreated attention problem is generating the situations that drive the worry, anxiety treatment addresses the symptom while the cause keeps producing new ones. Partial response to good anxiety treatment is a common reason adults eventually get evaluated for ADHD.
Does hyperfocus mean I don’t have ADHD?
No — hyperfocus is characteristic of ADHD, not evidence against it. ADHD involves difficulty regulating attention rather than an absence of it. Attention goes where it finds stimulation, which can mean six uninterrupted hours on something interesting and twenty minutes on something necessary.
Can adults be diagnosed with ADHD for the first time?
Yes. ADHD is a neurodevelopmental condition present since childhood, but it’s frequently missed — particularly in women and in people who did well academically and compensated successfully. Symptoms often become unmanageable when external structure disappears, such as after university, a promotion, or becoming a parent.
Does ADHD medication make anxiety worse?
It can in some people, which is one reason an accurate diagnosis should come before a prescription rather than after. Treatment decisions for someone with both conditions are individualized, and a psychiatric provider will weigh how the conditions interact for you specifically.
What does an adult ADHD evaluation involve?
A structured clinical interview covering current symptoms and developmental history, standardized rating scales, a review of school and work patterns, collateral information from someone who has known you a long time where available, and screening for conditions that mimic or accompany ADHD — anxiety, depression, sleep disorders and medical causes.
