The short answer
Both make it hard to concentrate, but for different reasons. In ADHD, attention itself works differently and the pattern is lifelong. In anxiety, worry crowds out focus. They also frequently occur together.
ADHD and anxiety both show up as a restless, unfocused mind, so they're easy to mix up, and they often coexist. The difference is what's driving the difficulty paying attention.
At a glance
| ADHD | Anxiety | |
|---|---|---|
| Why focus suffers | Attention regulation works differently | Worry consumes attention |
| Time course | Lifelong, present since childhood | Can begin at any age, often situational |
| Restlessness | Driven by understimulation and impulsivity | Driven by tension and dread |
| Typical first-line treatment | Stimulants or non-stimulants, plus skills and structure | Therapy such as CBT, sometimes SSRIs |
How they overlap
Trouble concentrating, restlessness, racing thoughts, and trouble sleeping show up in both, so on the surface they can look the same. They also genuinely co-occur. Many people have both, and untreated ADHD can fuel anxiety, while anxiety can make ADHD-style attention problems worse.
How they actually differ
In ADHD, the difference is in how attention itself is regulated. Focus, working memory, and impulse control work differently, the pattern has been present since childhood, and the restlessness often comes from understimulation, a mind looking for something more engaging. The difficulty is there whether or not the person is calm.
In anxiety, attention is fine in principle, but worry crowds it out. The mind is busy scanning for threats and running “what if” loops, and that’s what makes it hard to focus. Calm the worry and the concentration tends to return. The restlessness is tension, not boredom.
When it’s one and when it’s the other
A useful question is whether the focus problems predate the worry and have been there lifelong. ADHD doesn’t start in adulthood; the signs reach back into childhood. If concentration only falters when anxiety is high and improves when it settles, that points toward anxiety. When both have been present for years, it may well be both.
Why the distinction matters
The treatments differ and can even work at cross-purposes if the diagnosis is wrong. ADHD is often treated with stimulants or non-stimulant medication plus structure and skills; anxiety is often treated with therapy like CBT and sometimes SSRIs. Because they overlap so often, a careful evaluation that considers both is the way to get it right.
Look up the terms
Sources
- Attention-Deficit/Hyperactivity Disorder (ADHD), National Institute of Mental Health
- Anxiety Disorders, National Institute of Mental Health
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