ADHD and Anxiety: Understanding the Overlap (2026)

If you have ADHD, there's roughly a coin-flip chance you also have a diagnosable anxiety disorder. The AADPA Clinical Practice Guideline puts the number at up to 50% of adults with ADHD — roughly 10 times what you'd expect by chance. And if you've been treated for anxiety for years without it fully resolving, ADHD may be part of the picture.

• The numbers in detail:**
• Generalised anxiety disorder (GAD): affects approximately 25-30% of adults with ADHD
• Social anxiety disorder: affects approximately 20-30% of adults with ADHD, driven by years of social mistakes, rejection, and criticism
• Panic disorder: elevated rates compared to general population
• Specific phobias: moderately elevated
• OCD: higher co-occurrence than previously recognised, particularly in women with ADHD

In children, anxiety co-occurs with ADHD in approximately 25-35% of cases, making it the second most common comorbidity after oppositional defiant disorder.

Why this matters for Australia specifically: The Deloitte Access Economics report estimated the total annual cost of ADHD in Australia at $20.42 billion, with comorbid conditions — anxiety foremost among them — driving a significant portion of healthcare costs, lost productivity, and reduced quality of life. When ADHD and anxiety are both present but only one is treated, outcomes are significantly worse than when both conditions are addressed.

The underdiagnosis problem: Many Australians with both conditions are diagnosed with anxiety first and ADHD much later — or not at all. A 2023 submission to the Senate ADHD inquiry noted that women in particular frequently receive anxiety or depression diagnoses for years before ADHD is identified as the underlying driver. This pattern of ADHD being hidden behind an anxiety diagnosis is one of the most common diagnostic errors in adult mental health. See our guide on ADHD in women for more on this pattern.

The relationship between ADHD and anxiety is bidirectional — each condition worsens the other, creating a reinforcing cycle that can be difficult to untangle without professional assessment.

• How ADHD causes anxiety:**
• Chronic failure and criticism: Years of forgetting things, missing deadlines, losing belongings, and underperforming relative to ability create a pervasive sense of "I'm going to mess this up." This is not irrational anxiety — it is a learned response to a lifetime of genuine failures.
• Rejection sensitive dysphoria (RSD): An intense emotional response to perceived criticism or rejection, experienced by an estimated 70% of people with ADHD. RSD can look identical to social anxiety but has a different mechanism — it is neurological hypersensitivity rather than cognitive distortion.
• Time blindness and deadline anxiety: People with ADHD often cannot intuitively sense how much time has passed or how much time is left. This creates chronic anxiety about being late, missing appointments, or running out of time.
• Working memory overload: The effort required to hold information in mind, remember tasks, and maintain focus is exhausting. The constant background awareness that you are likely forgetting something generates persistent low-grade anxiety.
• Executive function compensation: Many people with ADHD develop elaborate coping systems (lists, alarms, double-checking) that function as anxiety management strategies. Remove the ADHD and the "anxiety" often resolves.

• How anxiety worsens ADHD:**
• Avoidance: Anxiety drives avoidance of tasks, situations, and decisions — which looks identical to ADHD procrastination but has a different driver (fear vs understimulation)
• Working memory interference: Anxious thoughts occupy working memory capacity that is already limited by ADHD, making concentration even harder
• Analysis paralysis: Anxiety adds a layer of overthinking to ADHD's existing decision-making difficulties
• Sleep disruption: Anxiety-driven insomnia compounds ADHD-related sleep difficulties, and sleep deprivation worsens both conditions

Understanding this bidirectional relationship is essential for effective treatment — addressing only one side of the cycle leaves the other in place.

ADHD and anxiety share several surface-level symptoms, which is why they are so frequently confused. Accurate differentiation requires looking at the underlying mechanism, not just the observable behaviour.

• Key diagnostic clues:**
• Onset: ADHD symptoms must have been present before age 12 (even if not recognised at the time). Anxiety can develop at any age. If concentration difficulties began in childhood and worsened in adulthood, ADHD is more likely the primary condition.
• Context dependence: ADHD symptoms are present across all settings (even fun ones — people with ADHD still lose their keys and forget appointments on holiday). Anxiety symptoms are typically triggered by specific stressors and may improve when the stressor is removed.
• Response to medication: If a person's "anxiety" improves dramatically on stimulant medication, the anxiety was likely secondary to ADHD. Primary anxiety disorders typically do not improve with stimulants.
• Hyperfocus: The ability to intensely focus on highly interesting tasks for hours (while being unable to focus on boring tasks) is characteristic of ADHD and does not occur in pure anxiety.

A thorough clinical assessment by a provider experienced with both conditions is essential for accurate diagnosis. For more on differential diagnosis, see our guide on ADHD vs anxiety and depression in women.

If you've been on anxiety medication for years and still feel like something isn't right — you can manage the worry, but you still can't organise your life, finish tasks, or show up on time — there may be a reason. One of the most common errors in adult mental health is treating anxiety without checking whether ADHD is driving it.

• What typically happens:**
• A person presents to their GP with anxiety, difficulty concentrating, and sleep problems
• They receive a GAD or social anxiety diagnosis and are prescribed an SSRI (e.g., sertraline, escitalopram)
• Anxiety improves somewhat, but concentration, organisation, and time management do not improve — or get slightly worse (SSRIs can increase ADHD-like cognitive dulling in some people)
• CBT for anxiety helps with worry management but does not address the executive function deficits driving the chronic failures that created the anxiety in the first place
• The person remains functionally impaired, often blamed for "not trying hard enough" or told their medication "should be working"

• Why this pattern occurs:**
• ADHD generates real-world problems (missed deadlines, forgotten appointments, disorganised finances, relationship conflicts)
• These real-world problems generate rational anxiety
• Treating the anxiety without fixing the executive function deficits means the real-world problems continue
• The anxiety returns because the source of the anxiety (ADHD-driven failures) has not been addressed

The AADPA and NICE guidelines both recommend: When ADHD and anxiety co-occur, and ADHD appears to be the primary condition, treat the ADHD first. In many cases, anxiety symptoms significantly reduce or resolve entirely once ADHD is effectively treated — because the source of the anxiety (chronic executive dysfunction) has been addressed.

Evidence: Research consistently shows that stimulant medication for ADHD does not worsen anxiety in most patients and often improves it. A systematic review published in the Journal of Clinical Psychiatry found that methylphenidate and amphetamine-based medications either had no effect on anxiety or reduced it in the majority of patients with comorbid ADHD and anxiety.

When anxiety IS the primary condition: If anxiety predates ADHD symptoms and is clearly independent of ADHD-related failures, treating anxiety first may be appropriate. This is where clinical judgement and thorough history-taking are essential.

The AADPA guideline recommends an integrated treatment approach when both conditions are present.

Medication:

• Key medication considerations:**
• Start stimulant medication at a lower dose than usual and titrate more slowly if anxiety is significant
• Most patients find that anxiety improves with stimulant treatment as executive function improves
• A minority (~15-20%) experience increased anxiety on stimulants — this is typically dose-related and resolves with dose reduction
• If stimulants genuinely worsen anxiety, atomoxetine (Strattera) is an evidence-based alternative that also has anxiolytic properties

• Psychological therapy:**
• CBT for ADHD differs from standard CBT for anxiety. ADHD-focused CBT emphasises executive function strategies (time management, organisation, task initiation) alongside cognitive restructuring
• CBT for anxiety (exposure-based, worry management) may be needed as an add-on if anxiety persists after ADHD treatment
• An ADHD-aware therapist understands that missed appointments, forgotten homework, and irregular session attendance are ADHD symptoms, not resistance or lack of motivation
• Accessed via Better Access: up to 10 Medicare-rebated sessions per year with a Mental Health Treatment Plan from your GP

• Practical strategies:**
• Externalise and label: "Is this my ADHD or my anxiety?" — this simple question helps separate the two and choose the right coping strategy
• Body-based approaches: Exercise is independently evidence-based for both ADHD and anxiety. Even 20-30 minutes of moderate exercise has measurable effects on both conditions.
• Environmental design: Reducing the number of things you need to remember (automating bills, using a single calendar, setting alarms) reduces ADHD-driven anxiety at the source
• Mindfulness: Evidence for mindfulness in ADHD is growing but modest — it is more effective for the anxiety component than the ADHD component

For more on treatment approaches, see our guides on ADHD treatment options, ADHD therapy, and ADHD medication in Australia.

The provider you choose matters a lot here. Not every mental health professional thinks to look for ADHD when someone presents with anxiety — and that oversight is exactly how people end up in years of incomplete treatment. Here's what to look for:

• What to look for:**
• Providers who explicitly list both ADHD and anxiety as areas of expertise
• Psychiatrists who assess for ADHD when a patient presents with treatment-resistant anxiety
• Psychologists trained in CBT adapted for ADHD (not just standard anxiety-focused CBT)
• Providers who ask about childhood symptoms, academic history, and executive function during an anxiety assessment

• Red flags in a provider:**
• "We need to treat your anxiety first before we can assess for ADHD" — this is outdated advice. Both can be assessed simultaneously.
• "Stimulants will make your anxiety worse" — this is not supported by the evidence for most patients. The AADPA and NICE guidelines recommend stimulants even when anxiety is present.
• "You can't have ADHD because you did well in school" — academic achievement does not rule out ADHD, particularly in intelligent individuals who compensated through effort and anxiety
• Unwillingness to consider ADHD in someone already diagnosed with anxiety

• Questions to ask:**
• "Do you assess for ADHD in patients who present with anxiety?"
• "What is your approach to treating someone with both ADHD and anxiety?"
• "Are you familiar with the AADPA guideline recommendations for comorbid ADHD and anxiety?"

• Medicare-funded pathways:**
• GP Mental Health Treatment Plan: access 10 psychology sessions per year (rebate: $145.25 per session for clinical psychologist via Item 80010)
• Psychiatrist referral from GP: Medicare rebate of $455.60 for initial consultation (Item 291)
• Both ADHD and anxiety can be addressed under the same Mental Health Treatment Plan — you do not need separate plans

Using our directory: Search for providers who list both ADHD and anxiety in their areas of focus. Use our telehealth filter if there are no suitable local providers — many experienced ADHD clinicians offer assessment and therapy sessions via telehealth. We currently list 1000 ADHD providers across Australia.

For more on how anxiety presents differently in women with ADHD, see our guide on ADHD vs anxiety in women. For information on assessment costs and Medicare rebates, see our assessment cost guide and Medicare rebates guide.