Anxiety and ADHD both cause poor concentration and restlessness, but the mechanism differs. In ADHD, attention fails on boring tasks and works fine on interesting ones, and symptoms date to childhood. In anxiety, worry hijacks attention regardless of the task, and symptoms often started later. Many adults have both.
A patient sits down and says: I cannot focus, my mind races, I cannot sit still, I forget things constantly, and I lie awake at night. Those five complaints are consistent with generalized anxiety disorder. They are also consistent with ADHD. And they are consistent with having both, which the research suggests is true for somewhere between a quarter and a half of adults with ADHD.
Telling the two apart is one of the most common jobs in adult psychiatry, and it matters because the treatments diverge. A stimulant given to someone whose real problem is anxiety can make things worse. An SSRI given to someone whose real problem is ADHD will leave the core symptoms untouched. Here is how we approach the question.
What the two conditions share
Both anxiety and ADHD interfere with working memory, the mental scratchpad you use to hold information while you use it. Both cause restlessness. Both disrupt sleep. Both make it hard to start and finish tasks, and both lead to procrastination, missed deadlines and a chronic sense of being behind. Both are associated with irritability and low frustration tolerance. And both, when untreated for years, produce the secondary problems of low self-esteem and demoralization that can look like depression.
The overlap is real, which is why self-diagnosis from a symptom list is unreliable. The differences are in the texture of the symptoms and in their history.
Where they differ
| Feature | ADHD | Anxiety disorder |
|---|---|---|
| When concentration fails | On boring, repetitive or low-stimulation tasks; attention is often excellent on interesting ones (hyperfocus) | Across tasks, because worry intrudes regardless of how engaging the task is |
| What is going on in the mind | Thoughts jump between unrelated topics; the mind wanders, often pleasantly | Thoughts circle around a threat or problem; the mind worries, unpleasantly |
| How restlessness feels | A need for stimulation, boredom, fidgeting to stay engaged | Tension, being keyed up, bracing for something bad |
| Onset | Childhood; symptoms present before age 12 even if not diagnosed | Can begin at any age; often tied to a stressful period |
| Course | Steady and lifelong, with impairment varying by demands | Fluctuates with stress; may have clear better and worse periods |
| Forgetfulness | Loses items, misses appointments, forgets what was just said, in all contexts | Forgets because preoccupied; memory is fine when calm |
| Procrastination | Cannot get started because the task is not stimulating enough; often works at the last minute when adrenaline kicks in | Avoids the task because of fear of doing it badly or being judged |
| Physical symptoms | Minimal | Racing heart, sweating, muscle tension, stomach upset, panic attacks |
| Sleep | Trouble winding down, delayed sleep phase, mind busy but not worried | Trouble falling asleep because of worry; early waking |
| Response to a stimulant | Calmer, more organized | More anxious, jittery |
The questions that separate them
In the evaluation, a few questions do most of the work.
What happens when the task is something you love? A person with ADHD can often describe losing hours to a video game, a project or a book while being unable to read a one-page memo. A person with pure anxiety finds that worry follows them into the things they love, too.
What were you like in elementary school? ADHD is a neurodevelopmental condition that is present from childhood. Report cards mentioning daydreaming, not finishing work, talking too much or careless mistakes are evidence. Anxiety can also begin in childhood, but a person whose attention problems began at 28 after a difficult job change almost certainly does not have ADHD.
What is your mind doing when you cannot focus? Wandering and worrying feel different from the inside, and people can usually tell you which it is when asked directly.
Does your body join in? Anxiety is a whole-body state. Palpitations, shortness of breath, nausea and muscle tension point toward anxiety. ADHD does not produce those.
When both are present
Comorbidity is the rule rather than the exception. Large epidemiological samples, including the National Comorbidity Survey Replication, found that roughly half of adults with ADHD had an anxiety disorder at some point. Part of this is shared biology, and part is consequence: years of forgetting things, missing deadlines and being told you are not living up to your potential will make most people anxious. In that case the anxiety is real, but it is downstream of the ADHD, and treating the ADHD often reduces it.
The reverse happens too. Chronic anxiety can produce a picture that looks exactly like inattentive ADHD in an adult who never had attention problems as a child. Treating the anxiety resolves the attention problem.
And some people simply have both, independently, and need both treated.
Why treatment order matters
When both conditions are present, which one you treat first is a clinical judgment. Our general approach follows the guidance from the Canadian ADHD Resource Alliance and similar bodies: treat the more impairing condition first, and if anxiety is severe, stabilize it before starting a stimulant.
Stimulants improve ADHD symptoms in most patients and, somewhat counterintuitively, reduce anxiety in many people whose anxiety was driven by ADHD-related chaos. But in people with a primary anxiety disorder, stimulants can heighten physical arousal and worsen panic. If anxiety is moderate or severe, starting an SSRI first and adding a stimulant once the anxiety is controlled tends to go more smoothly.
Non-stimulant ADHD medications are a useful middle path. Atomoxetine has evidence for treating both ADHD and comorbid anxiety, and guanfacine extended-release can reduce both inattention and physical hyperarousal. For a patient with both conditions who is wary of stimulants, these are often where we start.
Therapy matters for both. Cognitive behavioral therapy is the first-line psychological treatment for anxiety disorders, and CBT adapted for adult ADHD, which focuses on organizational skills, planning and managing distractibility, has solid evidence as an add-on to medication. For the combined picture, a therapist who understands both is worth seeking out.
What not to do
Do not self-diagnose from a social media checklist and ask for a specific medication. The lists are accurate as far as they go, but they cannot weigh the features that distinguish the two conditions. Do not assume that because a stimulant helped once, you have ADHD; stimulants improve concentration in nearly everyone, which is why the response to medication is not diagnostic. And do not treat the anxiety for years without asking whether something underneath it was never addressed.
How we evaluate it
At Stedfast Psychiatry an evaluation for this question is a 60 to 90 minute structured interview with a psychiatrist, psychiatric nurse practitioner or physician assistant, covering both conditions in full along with mood, sleep, substance use and medical history. We use the ASRS for ADHD and the GAD-7 for anxiety, and we ask for childhood history, ideally with a parent's input or old school records. Where the picture remains unclear, we may start treatment for the more confident diagnosis and observe what remains. The evaluation is available at all 13 offices in Florida and South Carolina and by telehealth. The self-pay rate for a new-patient visit is $185, and most insurance and Medicare are accepted.
Frequently asked questions
Can anxiety be mistaken for ADHD?
Yes, often. Chronic anxiety impairs working memory and concentration in ways that mimic inattentive ADHD. The key differences are that anxiety-driven attention problems occur across all tasks, including enjoyable ones, come with physical symptoms like tension and racing heart, and often began in adulthood rather than childhood.
Can you have both anxiety and ADHD?
Yes, and it is common. Surveys suggest roughly a quarter to a half of adults with ADHD also have an anxiety disorder. Sometimes the anxiety is a consequence of years of untreated ADHD; sometimes both exist independently. Treatment addresses both, usually starting with whichever is more impairing.
Do stimulants make anxiety worse?
They can, in people with a primary anxiety disorder, by increasing physical arousal. In people whose anxiety stems from ADHD-related disorganization, stimulants often reduce anxiety. When anxiety is moderate or severe, clinicians typically control it first or choose a non-stimulant such as atomoxetine or guanfacine.
If a stimulant helps me focus, does that mean I have ADHD?
No. Stimulants improve concentration in most people regardless of diagnosis, so response to medication is not diagnostic. ADHD is diagnosed from the pattern and history of symptoms, including onset in childhood and impairment across settings.
Which should be treated first, anxiety or ADHD?
Generally the condition causing more impairment. If anxiety is severe, it is usually stabilized with an SSRI and therapy before a stimulant is introduced. If ADHD is clearly primary and anxiety is mild, treating the ADHD first often improves both. A psychiatric evaluation makes this call.
Related reading
- ADHD Testing Near Me: What an Evaluation Actually Involves
- How to Get Diagnosed With ADHD as an Adult
- Non-Stimulant ADHD Medications Explained
- Signs of High-Functioning Depression
- Can a Psychiatrist Prescribe ADHD Medication Over Telehealth?
This article is educational and does not replace evaluation by a licensed clinician. If you are in crisis, call or text 988.