ADHD vs Anxiety: How to Tell the Difference

You can't concentrate. Your mind races. You feel restless, overwhelmed, and constantly behind. A GP might look at those symptoms and diagnose anxiety. And they might be right — but they might also be missing something. ADHD and anxiety produce strikingly similar surface-level symptoms, and the overlap causes real problems: misdiagnosis, ineffective treatment, and years of wondering why you're not getting better.

Why ADHD and Anxiety Look So Similar

Both conditions can cause difficulty concentrating, restlessness, sleep problems, irritability and a sense of being overwhelmed. The Royal College of Psychiatrists notes that ADHD is frequently misdiagnosed as anxiety, depression, or personality disorder because so many of the visible symptoms overlap.

A person with anxiety might struggle to focus because their mind is consumed with worry. A person with ADHD might struggle to focus because their brain jumps between stimuli without a filter. From the outside, both people look the same: distracted, stressed, underperforming. But the underlying mechanism — and the appropriate response — is entirely different.

Key Differences Between ADHD and Anxiety

The single most useful distinction is timeline. ADHD is a neurodevelopmental condition — symptoms begin in childhood (before age 12) and persist throughout life, even if they weren't recognised at the time. Anxiety can develop at any age and is often triggered by specific circumstances: a stressful job, a life event, a period of uncertainty. If your concentration problems are lifelong and predate any obvious stressor, ADHD becomes more likely.

The nature of the restlessness differs too. ADHD restlessness is driven by under-stimulation — your brain is seeking input, novelty, anything to engage with. Anxiety restlessness is driven by threat — your nervous system is on high alert, scanning for danger. ADHD restlessness often improves when you're doing something engaging; anxiety restlessness tends to persist regardless.

Concentration difficulties follow a similar pattern. With ADHD, you struggle to focus on boring or routine tasks but can hyperfocus on things that interest you. With anxiety, concentration is disrupted across the board because worry occupies your mental bandwidth. If you can lose three hours to a fascinating article but can't read a single page of a work report, that selective attention pattern is more consistent with ADHD.

The Comorbidity Problem: When You Have Both

Here's where it gets more complicated: having both ADHD and anxiety is extremely common. The 2023/24 Adult Psychiatric Morbidity Survey found that more than one in three adults screening positive for ADHD also met the criteria for an anxiety disorder. Mind notes that many adults with ADHD develop anxiety as a secondary response — years of missed deadlines, social mistakes, and underperformance create a cycle of worry and self-doubt.

In these cases, treating only the anxiety leaves the root cause unaddressed. The anxiety may improve temporarily but keeps returning because the ADHD-related struggles that generate it haven't changed. Effective treatment usually means addressing both conditions, often with a combination of ADHD-specific strategies (and potentially medication) alongside anxiety management.

How to Work Out What's Going On

1. 1

   Map your history. Write a timeline: when did concentration problems start? Were there signs in childhood (school reports are gold dust here)? Did anxiety come first, or did the focus issues predate the worry? This chronology is what clinicians use to differentiate the two.

2. 2

   Notice the pattern of your focus difficulties. Do they apply to everything equally (anxiety pattern), or are they selective — worse for boring tasks, better for engaging ones (ADHD pattern)? Track this over a week or two.

3. 3

   Consider the 'why' behind your restlessness. Are you restless because you're under-stimulated and bored, or because you feel on edge and anxious? The sensation can feel similar but the trigger is different.

4. 4

   Take a screening. Our free ADHD screening chatbot can give you a quick indication of whether your symptoms align with ADHD specifically, which is useful context before speaking to your GP.

5. 5

   Talk to your GP with your evidence. Bring your timeline, your observations, and any school reports you can find. Ask specifically about ADHD assessment — don't just describe symptoms of anxiety, as that may lead to an anxiety diagnosis by default.

What Happens If It Is ADHD?

If assessment confirms ADHD — whether alongside anxiety or instead of it — a range of support options open up. ADHD-specific treatment (including medication and behavioural strategies) often reduces anxiety symptoms too, because it addresses the underlying cause of the stress. You'll also become eligible for workplace support through Access to Work, which can fund coaching, organisational tools, and other practical support.

For a detailed look at the assessment process, see our guide on what happens in an ADHD assessment. If you're ready to approach your GP, our article on how to talk to your GP about ADHD walks you through exactly what to say.

Sources

Royal College of Psychiatrists — ADHD in adults · NHS Digital — Adult Psychiatric Morbidity Survey 2023/24 · Mind — ADHD and mental health · NHS — ADHD in adults · NICE Guideline NG87 — ADHD: diagnosis and management