Anxiety and ADHD: How They Overlap and How to Tell Them Apart

The shared symptoms that cause confusion

Both anxiety and ADHD produce difficulty concentrating, but through different mechanisms. In anxiety, concentration is disrupted by intrusive worried thoughts that compete for cognitive resource. In ADHD, concentration difficulty reflects differences in attention regulation: the ability to direct and sustain attention voluntarily is impaired regardless of whether worry is present.

Restlessness is common in both. In anxiety, it reflects the physiological arousal of the stress response. In ADHD, it reflects the hyperactivity component of attentional dysregulation and the low tolerance for understimulation.

Sleep difficulties are common in both but for different reasons. Anxiety disrupts sleep through cognitive arousal and worry at bedtime. ADHD disrupts sleep through difficulty winding down, reduced melatonin production and the tendency for ADHD brains to become more active later in the evening.

Emotional dysregulation, particularly disproportionate emotional reactions and difficulty calming after emotional activation, is present in both conditions and is one of the most commonly overlooked features of ADHD.

The key distinguishing features

The most useful distinguishing question is: does the difficulty with concentration, restlessness or disorganisation occur across all contexts or mainly in anxiety-provoking ones?

In anxiety, the cognitive and functional difficulties are primarily present in the context of anxiety-provoking situations and worrying. When the anxiety is low, concentration, organisation and functioning are significantly better. In ADHD, the difficulties are pervasive: they occur regardless of anxiety level, across all types of tasks, and have typically been present since childhood even before anxiety developed.

The quality of the distraction is also different. In anxiety, attention is captured by threat-related content: the worry thoughts, the feared outcomes, the physical sensations of anxiety. In ADHD, attention is captured by novelty, interest and stimulation: whatever is more immediately engaging than the task at hand, regardless of whether it is anxiety-related.

The anxiety or ADHD quiz on this site helps map which pattern is more prominent in your specific presentation.

When anxiety and ADHD co-occur

ADHD and anxiety disorders co-occur at high rates: approximately 50 percent of adults with ADHD also have at least one anxiety disorder. This complicates assessment significantly because the presenting symptoms reflect both conditions simultaneously.

One useful distinction in co-occurring presentations is the direction of causation. ADHD-driven anxiety is anxiety that arises as a consequence of ADHD difficulties: the accumulated experience of failing to meet expectations, of losing things, of missing deadlines and of negative social feedback produces a secondary anxiety about performance and competence.

Primary anxiety disorder with ADHD is a more complex presentation requiring assessment and treatment that addresses both conditions. This is one of the strongest arguments for professional assessment rather than self-diagnosis when both ADHD and anxiety features are present.

Why the distinction matters for treatment

CBT for anxiety focuses on changing the cognitive distortions and avoidance behaviours that maintain the anxiety. This approach is less effective for the core symptoms of ADHD because those symptoms are not primarily maintained by cognitive or behavioural patterns but by neurobiological differences in attention regulation.

Conversely, ADHD-focused interventions such as task breakdown, environmental structure and stimulant medication do not address the catastrophic thinking and avoidance patterns that maintain anxiety disorders.

In presentations where both conditions are present, effective treatment typically addresses anxiety first, because the heightened arousal of anxiety makes ADHD symptoms worse and because anxiety responds more directly to psychological intervention.

Getting a clear picture

Self-assessment tools can help you understand which pattern is more prominent but are not substitutes for professional assessment when ADHD is a significant consideration. ADHD assessment requires developmental history, multiple informant perspectives and standardised testing that goes beyond what a quiz can provide.

The anxiety or ADHD quiz gives you a useful initial picture. The anxiety level test assesses the severity and nature of the anxiety component specifically. If the picture remains unclear after these, professional assessment is the most reliable route to an accurate diagnosis and effective treatment plan.