ADHD vs Anxiety: How to Tell the Difference

Attention Deficit Hyperactivity Disorder (ADHD) and anxiety are two of the most commonly diagnosed mental health conditions in adults. They can look very similar on the surface, which is why many people are misdiagnosed or live for years with the wrong explanation for their struggles.

Understanding the difference matters because treatment approaches are very different.

Why ADHD and Anxiety Are Often Confused

Both ADHD and anxiety can cause:

• difficulty concentrating

• restlessness

• sleep problems

• irritability

• feeling overwhelmed

However, the reasons behind these symptoms are different.

ADHD is a neurodevelopmental condition involving differences in executive functioning such as planning, working memory, and impulse control (Barkley, 2015).

Anxiety disorders involve excessive fear and worry, often linked to threat perception and hypervigilance (American Psychiatric Association, 2022).

Because ADHD can lead to missed deadlines, disorganisation, and life stress, many people develop anxiety secondary to untreated ADHD.

Research suggests that around 40–60% of adults with ADHD also experience an anxiety disorder (Kessler et al., 2006).

When ADHD Is Mistaken for Anxiety

Many adults are initially diagnosed with anxiety because their visible symptoms include:

• racing thoughts

• constant worry about forgetting things

• feeling overwhelmed by daily tasks

However, the underlying cause may be ADHD-related executive dysfunction.

For example, someone with ADHD may appear anxious about work deadlines. In reality, the distress is coming from difficulty organising tasks or starting them.

Once ADHD is treated, the anxiety often reduces.

When Anxiety Is Mistaken for ADHD

The opposite can also happen.

People experiencing severe anxiety may struggle to focus because their mind is preoccupied with worry. This can look like ADHD inattentiveness.

However, the key difference is that concentration problems in anxiety are usually triggered by worry, whereas ADHD attention difficulties are consistent across situations and lifelong.

ADHD can often cause anxiety because of the stress of managing executive dysfunction.

If ADHD is mistaken for anxiety, treatment may focus only on reducing worry without addressing executive function difficulties.

If anxiety is mistaken for ADHD, stimulant medication may not address the underlying fear-based symptoms.

A thorough assessment should always explore:

• childhood history

• functioning across different environments

• patterns of attention and emotional regulation

Accurate diagnosis allows people to receive the right support and strategies.

Bibliography

American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR).

Barkley, R. A. (2015). Attention-Deficit Hyperactivity Disorder: A Handbook for Diagnosis and Treatment. Guilford Press.

Kessler, R. C., Adler, L., Barkley, R., et al. (2006). The prevalence and correlates of adult ADHD in the United States. American Journal of Psychiatry, 163(4), 716–723.

Willcutt, E. G., Doyle, A. E., Nigg, J. T., et al. (2005). Validity of the executive function theory of ADHD. Biological Psychiatry, 57(11), 1336–1346.