ADHD and anxiety can look strikingly similar from the outside: trouble focusing, restlessness, racing thoughts, trouble sleeping. But the engine differs. In ADHD, attention wanders because the brain under-stimulates and seeks novelty; in anxiety, attention is hijacked by worry and threat. Telling them apart matters, because what helps one can worsen the other.
They also co-occur in a large share of people. Two quick screens — the adult ADHD test and the anxiety test — can help you and a clinician see which is driving things, or whether it’s both.
| Aspect | ADHD | Anxiety |
|---|---|---|
| Why focus fails | Under-stimulation, distractibility | Worry crowds out attention |
| Restlessness | Needs movement/novelty | Driven by nervous tension |
| Timeline | Lifelong, since childhood | Can start any time, often situational |
| Racing thoughts | Many topics, interest-driven | Circling the same fears |
| Rest | Boredom-averse even when calm | Eases when the stressor passes |
| Overlap | Anxiety often co-occurs | Can be a reaction to years of ADHD struggle |
The chicken-and-egg problem
Untreated ADHD can generate anxiety — years of missed deadlines, lost items, and "why can’t I just do this?" breed genuine worry. So anxiety is sometimes the surface layer over an ADHD foundation, which is why treating the anxiety alone can leave the core problem untouched.
How to sort it out
The clearest signal is timeline and context: ADHD is lifelong and present across situations, while anxiety often attaches to specific stressors and can come and go. If focus problems have been with you since childhood, ADHD is worth screening for. If you recognise both, that’s common — take both tests and bring the results to a professional.
Common questions
- Can anxiety cause ADHD-like symptoms?
- Yes. Anxiety impairs concentration and working memory, which can mimic inattentive ADHD — one reason a proper assessment looks at your whole history.
- Can you have both ADHD and anxiety?
- Very commonly. Anxiety is one of the most frequent conditions to co-occur with ADHD.
- Which should I screen for first?
- If the focus problems are lifelong, start with the ADHD screen; if they’re newer and tied to stress, start with anxiety. Or take both.