When ADHD looks like anxiety — and why the distinction matters

Overlapping symptoms can obscure whether attention problems are driven by ADHD, anxiety or both, making a person’s history and day-to-day patterns crucial to assessment.

“What’s going on?” and “Why am I feeling this way?” are questions that often sit at the centre of therapy, especially when symptoms overlap. ADHD and anxiety are a clear example. They are different conditions, but in everyday life they can look remarkably alike, with both commonly involving poor concentration, forgetfulness, restlessness, procrastination, sleep problems, irritability and difficulty making decisions. Healthline and Medical News Today both note that this overlap can make the two conditions difficult to tell apart, particularly when a person is experiencing several symptoms at once.

The key difference is usually not the behaviour itself, but what is driving it. ADHD is a neurodevelopmental condition linked to differences in attention, planning, organisation, working memory, emotional regulation and impulse control. Anxiety, by contrast, is tied more closely to the brain’s threat-detection system, which can push the body into a state of heightened alertness. In that state, attention often narrows on worry, possible mistakes or imagined worst-case outcomes, making it harder to focus on anything else. This is why the same outward sign can mean very different things depending on the context, according to the guidance reviewed by Healthline, Medical News Today and other clinical summaries.

That distinction is especially useful when looking at specific symptoms. Difficulty concentrating in ADHD often reflects attention that is variable and strongly shaped by interest, novelty or urgency, whereas anxiety can interrupt focus because the mind keeps returning to worries and “what if” thoughts. Procrastination may stem from task initiation problems in ADHD, but in anxiety it is often linked to fear, uncertainty or perfectionism. Restlessness can also have different roots: in ADHD it may be a need for movement or stimulation, while in anxiety it may accompany muscle tension, racing thoughts and physical unease. Forgetfulness, overwhelm and impulsive behaviour can arise in both conditions, but the underlying mechanisms may differ in each case.

The picture becomes even more complicated because ADHD and anxiety frequently appear together. Healthline says around one-quarter of people with ADHD have a diagnosable anxiety disorder, while other clinical sources place the rate much higher in some adult groups, with estimates ranging from roughly 25% to 50%. When the two conditions co-occur, each can intensify the other. ADHD-related missed deadlines, forgotten appointments or chronic disorganisation can create understandable worry, while anxiety can make it even harder to organise thoughts, start tasks or sustain attention. That cycle can leave people feeling as though they are constantly playing catch-up.

This is where careful assessment matters. Psychologists do not just look at whether someone matches a symptom checklist; they also consider when the difficulties began, how they change across settings, what makes them better or worse, and how they fit with the person’s wider life history. That process, known as formulation, helps distinguish between ADHD, anxiety, both conditions, or another explanation altogether. For parents and caregivers in particular, that kind of clarity can be useful because it shifts the focus from blame to understanding, and from generic advice to support that actually fits the person’s needs.