ADHD vs Anxiety: How to Tell the Difference

They Look Surprisingly Similar

If you’ve ever searched your symptoms online and come away more confused than you started, you’re not alone. ADHD and anxiety share a remarkable number of overlapping symptoms: difficulty concentrating, restlessness, sleep problems, irritability, and avoidance of challenging tasks.

In my practice, I frequently work with clients who were initially treated for anxiety alone, only to discover that ADHD was driving many of their symptoms. Others come in convinced they have ADHD, only to find that anxiety is the primary issue. And for a significant number of people, both conditions are present simultaneously.

Key Differences

The Source of Difficulty Concentrating

With ADHD, concentration difficulties stem from an interest-based nervous system. Your brain struggles to engage with things that aren’t novel, interesting, urgent, or challenging — regardless of how important they are. You might hyperfocus for hours on something that captures your attention while being unable to give five minutes to a critical work task.

With anxiety, concentration difficulties come from worry. Your mind is so occupied with anxious thoughts that there’s little bandwidth left for the task at hand. You’re not disinterested — you’re overwhelmed.

The Nature of Restlessness

ADHD restlessness is an internal drive for stimulation. You fidget, pace, or bounce your leg because your brain is under-stimulated and seeking input. It often feels like having too much energy with nowhere to direct it.

Anxiety restlessness is driven by the fight-or-flight response. You can’t sit still because your body is preparing to respond to a perceived threat. It often comes with physical tension, a racing heart, or a sense of dread.

Why You Avoid Tasks

ADHD avoidance is usually about executive dysfunction. You want to do the thing — you know it’s important, you’ve told yourself you’ll do it a hundred times — but you can’t start. The barrier isn’t fear; it’s the inability to initiate or organise the task.

Anxiety avoidance is about fear. You avoid the task because it triggers worry — about failure, judgement, or consequences. The barrier is emotional, not executive.

When Both Are Present

Here’s what makes this genuinely complicated: ADHD and anxiety frequently co-occur. Studies suggest that roughly 25-50% of adults with ADHD also meet criteria for an anxiety disorder.

This isn’t a coincidence. Living with undiagnosed ADHD — years of missed deadlines, forgotten commitments, underperformance, and social mishaps — creates fertile ground for anxiety. Your nervous system learns to be hypervigilant because you’ve been burned so many times.

In my practice, I often work with clients where the presenting concern is anxiety, but underneath it lies unaddressed ADHD that has been generating anxious patterns for years.

Why Getting It Right Matters

The distinction matters because treatment approaches differ. Standard anxiety treatment might include relaxation techniques, exposure therapy, and challenging anxious thoughts. These are excellent approaches — for anxiety. But they won’t address ADHD-driven executive dysfunction or emotional dysregulation.

Conversely, ADHD strategies focused on organisation and time management won’t help if the underlying driver is chronic worry.

Getting the right understanding of what’s happening leads to the right intervention. And the right intervention leads to actual change, not just managing symptoms.

What to Do If You’re Unsure

If you’re not sure whether you’re dealing with ADHD, anxiety, or both, that’s completely fine. You don’t need to have it figured out before reaching out. A skilled therapist can help you untangle what’s happening and build a plan that addresses your specific needs.

What matters most isn’t the label — it’s understanding how your brain works and finding strategies that actually help.