ADHD and Anxiety in Adults: How They Overlap

Mark is 41 and runs his own small business in Limerick. Most mornings he wakes with a tight chest and a racing mind. His to-do list feels endless, not because it is unusually long, but because every item seems to carry the same weight. Answering an email feels as urgent as a missed invoice. Starting any task means confronting the possibility that he will not finish it.

For years, Mark assumed he had an anxiety problem. He tried breathing exercises, mindfulness apps, and reducing caffeine. Some things helped a little, but the underlying restlessness never really went away. When a therapist asked about his childhood and his difficulty sustaining attention, Mark began to wonder whether his anxiety was actually the result of living with undiagnosed ADHD.

His experience is not unusual. ADHD and anxiety frequently occur together, and untangling them can be the key to getting the right help.

Why ADHD and Anxiety Often Go Together

ADHD and anxiety are separate conditions, but they often feed each other. Living with ADHD means repeatedly failing to meet expectations despite genuine effort. Deadlines are missed, important details are forgotten, and promises are broken. Over time, this creates a background sense of dread. The brain learns to anticipate failure, and that anticipation becomes anxiety.

Research published in 2025 suggests that around 25–50% of adults with ADHD also have an anxiety disorder, with some studies finding the figure as high as 47%. Another study of over 350 adults with ADHD found that 56% had at least one anxiety disorder. By comparison, around 70% of adults with ADHD have at least one other mental health condition, making comorbidity the rule rather than the exception.

Dr. Russell Barkley describes the relationship well: ADHD makes people more vulnerable to anxiety because the world keeps asking them to do things their brains find difficult. The anxiety is not random or irrational. It is often a reasonable emotional response to a lifetime of inconsistent performance.

How Anxiety Shows Up in Adults with ADHD

When ADHD and anxiety occur together, the anxiety does not always look like textbook worry. It can show up as procrastination, perfectionism, irritability, or exhaustion. A person may avoid starting tasks because they fear they will not do them well. They may replay conversations, constantly check their phone, or lie awake planning how to catch up on work.

Physical symptoms are common too. Muscle tension, headaches, stomach problems, and difficulty sleeping often accompany anxiety. Stimulant medication, which helps many people with ADHD, can sometimes make anxiety feel worse, especially if the dose is too high or the underlying anxiety has not been addressed.

Social situations can also become a source of anxiety. Many adults with ADHD worry about saying the wrong thing, missing social cues, or appearing forgetful or rude. This can lead to withdrawal, which then reduces the chance of positive social experiences and reinforces the anxiety.

How to Tell ADHD and Anxiety Apart

Telling the two apart is not always straightforward because they share symptoms. Both can cause restlessness, difficulty concentrating, sleep problems, and irritability. The difference usually lies in the pattern and the underlying trigger.

ADHD-related inattention is persistent and present in many situations. It is often linked to trouble starting tasks, sustaining focus, and organising activities. Anxiety-related inattention tends to flare when a person is worried about a specific outcome. The mind is not necessarily distractible; it is preoccupied with worry.

Restlessness in ADHD often feels like an internal drive to move or do something. Restlessness in anxiety is more tied to a sense of threat or nervous arousal. A clinician will usually look at the timeline of symptoms, their severity, and how much they interfere with different areas of life.

Treatment Approaches for Both Conditions

Treating ADHD and anxiety together requires a careful, layered approach. If the ADHD is severe, treating it first can sometimes reduce anxiety because daily life becomes more manageable. If the anxiety is severe, particularly if it includes panic attacks or significant avoidance, the anxiety may need to be addressed before ADHD treatment is fully effective.

Medication can help both conditions, but the choices need to be made carefully. Stimulants may worsen anxiety in some people, while others find that as their ADHD symptoms improve, their anxiety naturally decreases. Non-stimulant ADHD medications or selective serotonin reuptake inhibitors may be considered when anxiety is prominent. These decisions should always be made with a psychiatrist who understands both conditions.

Psychotherapy is often essential. Cognitive behavioural therapy can help with anxious thoughts and avoidance behaviours. For ADHD specifically, CBT adapted for ADHD focuses on practical skills such as planning, time management, and emotional regulation. Therapy can also address the shame and low self-esteem that often build up after years of untreated ADHD.

Practical Strategies for Daily Life

Small changes can make a noticeable difference when ADHD and anxiety overlap. Breaking tasks into very small steps reduces the overwhelm that triggers avoidance. External reminders, visible calendars, and timers reduce the mental load of remembering what to do next.

Regular movement helps both conditions. Exercise reduces anxiety and improves focus, even if only for a short period. Sleep is equally important, though often difficult. Creating a consistent wind-down routine and limiting screens before bed can help reduce the racing thoughts that keep people awake.

Limiting caffeine and alcohol is sensible. Both can worsen anxiety and disrupt sleep. Mindfulness can be helpful for some people, but it is not a cure-all. If sitting still feels impossible, walking meditation or brief guided practices may be a better starting point.

Building routines can also reduce decision fatigue. When simple choices such as what to wear or what to eat take up mental energy, the brain has less capacity left for harder tasks. Routines and defaults remove some of those decisions and free up energy for what matters.

When to Seek Professional Help

It is time to seek help when symptoms are interfering with work, relationships, or your quality of life. If you are avoiding responsibilities, feeling constantly on edge, losing sleep, or relying on unhealthy coping strategies, talking to a professional is a sensible next step.

Your GP is a good starting point. They can assess your overall health, rule out physical causes, and refer you to a psychiatrist or psychologist. If you already have an ADHD diagnosis, let them know that anxiety has become a significant issue. Treatment may need to be adjusted to address both conditions together.

Therapy can be particularly helpful if you have spent years blaming yourself for struggles that may actually be related to ADHD. Many adults feel an enormous sense of relief when they finally understand the connection between their symptoms and their experiences.

If you recognise yourself in these descriptions, you may find it useful to read about the symptoms of adult ADHD and how ADHD is diagnosed in Ireland. Our broader guide on ADHD in adults in Ireland also covers daily management strategies.

Frequently Asked Questions

Can ADHD cause anxiety?

ADHD does not directly cause anxiety, but it creates conditions that make anxiety more likely. Repeated difficulties with organisation, time management, and emotional regulation can lead to chronic stress, which often develops into an anxiety disorder. Addressing the ADHD can therefore reduce the anxiety that stems from it.

Can you treat ADHD and anxiety at the same time?

Yes, but it requires a tailored plan. Medication choices, therapy focus, and coping strategies may need to be adjusted for the combination. A clinician experienced in both conditions is the best person to coordinate this.

Does stimulant medication make anxiety worse?

It can, particularly if the dose is too high or if the anxiety is severe and untreated. Some people find that stimulants reduce their anxiety by improving their ability to manage daily life. Others need their anxiety treated first, or need a non-stimulant option.

Is it possible to have anxiety that looks like ADHD?

Yes. Anxiety can cause difficulty concentrating, restlessness, and sleep problems that mimic ADHD. This is why a thorough assessment is important. Treating the wrong condition will not bring relief.

What therapy is best for ADHD and anxiety together?

Cognitive behavioural therapy is effective for anxiety and can be adapted for ADHD. Some therapists integrate mindfulness-based approaches or acceptance and commitment therapy. The best therapy is one delivered by someone who understands how ADHD and anxiety interact.

You Are Allowed to Take Up Space

Living with both ADHD and anxiety can feel like being pulled in two directions at once. One part of you wants to act, create, and move. Another part is terrified of getting it wrong. Neither part is your enemy, and neither has to run your life.

Getting the right diagnosis, or diagnoses, can be life-changing. It gives you a framework for understanding your struggles and opens the door to treatments that actually fit. You do not have to keep coping alone. Get matched with a therapist who understands ADHD and anxiety in adults and take the next step toward feeling steadier.

This article is for informational purposes only and does not constitute medical advice. If you are in crisis, please contact Samaritans Ireland at 116 123 or Pieta House at 1800 247 247.