Anxiety and ADHD Can Go Together – Here’s How to Untangle These Widespread Mental Health Disorders

For decades, one of the biggest challenges for treating neurological disorders like attention-deficit/hyperactivity disorder is that the symptoms often resemble those of other conditions. Anxiety disorders are very common when it comes to neurological diagnoses.

A child who struggles to sit, concentrate or complete tasks could be ADHD, anxiety, a learning disability or simply a reaction to stress at home. A teenager who seems emotionally unstable and withdrawn may be showing early signs of a mood disorder, ADHD or trauma. An adult who constantly misses time, forgets important obligations and feels chronic fatigue may be dealing with workplace burnout, severe anxiety disorder or undiagnosed ADHD.

I practice psychiatry at the National Medical Center “20 de Noviembre” in Mexico City, and am a professor of medicine at the National Autonomous University of Mexico, UNAM. In my work, I frequently see cases that initially seem like anxiety, but I often find that the issue is only the tip of the iceberg. Anxiety gets better, and what emerges is undiagnosed ADHD.

The opposite can also be true: what appears to be ADHD—difficulty concentrating, insomnia, poor performance—is sometimes caused by anxiety. However, in my practice, I often see the opposite scenario. Young people seek treatment for severe anxiety, but clinical assessments often show that their condition is linked to executive functions – such as planning and problem solving – that have been fragile since childhood. In this case, patients compensate for years of undiagnosed ADHD through relentless effort and fear of failure.

Untreated ADHD is important to diagnose because in adults the condition is associated with depression, anxiety, work problems, academic problems and financial stress.

Because these terms are closely related, it is not always possible to know which came first – and in many cases, both actually exist at the same time. Only the treatment of what is seen can bring real but only partial relief, leaving the real driver unaddressed.

That’s why an evaluation by a clinician who can evaluate the whole picture matters. When ADHD is properly diagnosed and treated, secondary anxiety often resolves more completely than it did with therapy or medication alone. But the opposite isn’t necessarily true: Treating anxiety doesn’t correct the underlying anxiety issues that may be driving it. Identifying the right goal – or goals – is what leads to continuous improvement. This comprehensive approach is especially important given the growing recognition that emotional disturbances—such as severe, rapid mood swings or an inability to manage one’s anxiety—are often undiagnosed symptoms of ADHD.

Here’s why undiagnosed ADHD can hide behind anxiety, some signs that can help differentiate the two conditions, and why this diagnostic blind spot — treating visual anxiety while missing the real ADHD — is so common.

How ADHD Hides

For a while I saw a patient in his late 20s who was suffering from anxiety when he came to the appointment convinced that he was finally recovering from a bad year. He had stopped having panic attacks, was sleeping well and no longer focused on his body, waiting for the next wave of panic. After several months of anti-stress and cognitive-behavioral therapy, the crises seemed under control.

But then something different appeared: constant trouble concentrating, procrastination that kept him stuck for hours, emotional speech and a severe inner restlessness. These symptoms are often overshadowed when a person feels suffocated by anxiety and consumed by worry.

Anxiety and ADHD have many common symptoms, including insomnia, irritability, sleep problems, and difficulty concentrating. This overlap can lead to diagnostic errors and treatments that do not address the underlying cause.

During childhood, many of the symptoms of ADHD are described as personality traits. A child may be labeled as confused, inconsistent, emotional or unstable. Over time, these people learn to compensate through increased effort, perfectionism, or constant self-monitoring—strategies that increase baseline stress and may lead to anxiety years later.

When the brain leaves survival mode

Anxiety is often the first way the body expresses overload. When responding to this threat becomes easier, pre-combat with a level of planning, organization, sustained attention and time management.

Many studies show a strong correlation between ADHD symptoms, anxiety and depression. In the UK, recent research has found that ADHD traits are stronger predictors of emotional problems than autism spectrum-related traits.

Systematic reviews indicate that 25% to 50% of adults with ADHD experience an anxiety disorder at some point in their lives. Major depressive disorder is also more common among this group than in the general population. For many people, anxiety is the result of years of trying to work with a weakened executive system, the part of the brain that manages planning, organizing and controlling stress.

Why ADHD Can Avoid Early Detection

It can be easy for parents, teachers or peers to misinterpret ADHD symptoms as traits. Anxiety can be seen as a bad mood, disorientation as lethargy, and difficulty maintaining attention as a lack of interest. In adults, these problems are often interpreted as personality defects rather than neuropsychiatric disorders.

ADHD rarely causes physical symptoms, but anxiety does. Heart palpitations, intense fear or insomnia make people seek care, while the signs of care are less well known.

ADHD is strongly genetic, with an estimated heritability rate of 70% to 80%. This genetic component also means that close relatives have a higher risk of emotional disorders such as anxiety and depression. When many family members share similar traits, these traits are often considered part of the family’s personality.

Primary anxiety versus anxiety due to ADHD

A key question in clinical practice is: What remains when anxiety subsides?

If emotional distress subsides but the following symptoms persist, then the pattern is consistent with adult ADHD:

– Long delay

– Difficulty starting tasks that require mental effort

– Frequently forgetting instructions or appointments

– Persistent internal instability

– Daily irregularity

– Easy distraction through minimal stimuli

A formal diagnosis, made by a trained health professional, requires an assessment of symptoms that have been present since childhood and establishes that the patient is impaired in more than one area of ​​life. Caregivers will rule out other medical or psychological causes, using reliable tools such as structured interviews and specific scales.

Neurobiological studies have shown that people with ADHD have identifiable differences in many areas of the brain, including their connections in deep neural tissue known as white matter and the brain’s reward circuitry. They also have imbalances in dopamine and norepinephrine – brain chemicals that regulate attention, motivation and impulse control. These differences can make it difficult for people to start or continue working.

The risk of treatment is only what is observed

Antidepressants and therapy can reduce emotional distress and significant symptoms such as insomnia or sleep disturbances, but they do not change the attention problems that create daily disruptions—affecting relationships, academic performance, and work performance. If this root is not addressed, the patient improves somewhat but continues to live in disorder, leading to new cycles of anxiety.

When I explain how anxiety can mask ADHD to patients, their most common reaction is a combination of relief and disappointment. They finally understand their emotional history, but notice that they have spent years interpreting their symptoms and struggles as flaws.

Studies show that adults with anxiety and untreated ADHD experience greater functional impairment and more relapse, meaning that their severe anxiety or depressive episodes return despite treatment or medication. They live under the burden of self-blame that hurts themselves. This cycle can repeat itself for years: emotional upsurge, relapse and then seeking treatment, without identifying the real problem.

The good news is that once ADHD is diagnosed, it is treatable. Strong evidence shows that treating ADHD at any age significantly reduces attention deficit and improves sustained attention and daily functioning.

Up-regulation of dopamine and norepinephrine enables patients to initiate tasks and sustain their efforts until the task is completed. When this happens, secondary anxiety is often profoundly reduced because people are no longer working twice as hard to keep up. It also improves their relationships at home, school and work.

Recognizing latent ADHD doesn’t erase the past, but it does change the future. When people understand the root cause of their anxiety and get the tools to manage it, they can move from survival to a more active life.