Anxiety and ADHD: when one brain operates in two conflicting modes

Two images of one experience

In psychological and psychiatric practice, it is very common to encounter a patient who describes seemingly contradictory experiences. On one hand, they talk about difficulties with concentration, impulsivity, mental chaos, and a sense of “internal distraction.” On the other hand, they describe tension, excessive worrying, a need for control, and a constant feeling that “something might go wrong.”

For years, these two patterns were treated as separate diagnostic entities. Today, we know that they very often co-occur, and their relationship is far more complex than a simple sum of symptoms.

ADHD and anxiety disorders do not merely overlap. In many cases, they co-create each other.

Epidemiological studies consistently show one finding: anxiety disorders occur in about one quarter to even half of individuals with ADHD. Differences depend on methodology and studied populations, but the direction remains constant — comorbidity is the norm, not the exception.

This raises a key question for both diagnosis and treatment: why do these two conditions so often go hand in hand?

Three levels of explanation: brain, cognition, and experience

The answer is not straightforward, but three complementary levels of explanation can be distinguished: neurobiological, cognitive, and experiential.

At the neurobiological level, ADHD and anxiety partly involve the same regulatory systems of the brain. The dopaminergic and noradrenergic systems play a key role here, influencing both attention regulation and threat processing. In simple terms — the brain does not have separate “systems” for concentration and anxiety. It uses partially overlapping neural networks for both functions. When their regulation is disrupted, effects may appear in both domains simultaneously.

At the cognitive level, the differences are more subtle but highly significant. ADHD is primarily associated with difficulty maintaining stable attention. The mind easily shifts between stimuli, seeks novelty, and has a limited ability to “stay on track.” Anxiety works in the opposite way — it narrows attention and pulls it toward potential threats.

When both mechanisms coexist, a characteristic experience emerges: part of the mind drifts in many directions at once, while another part remains “stuck” on negative scenarios. Subjectively, this is experienced as overload, difficulty with linear thinking, and constant cognitive tension.

The third level concerns lived experience. In ADHD, many individuals spend years in a repeating cycle: difficulties in organization, consequences in the form of stress, and then attempts to compensate through increased control. Over time, this can lead to chronic tension and hypervigilance. Anxiety does not then appear “out of nowhere,” but develops as an adaptive response to repeated functional difficulties in daily life.

Secondary anxiety, primary anxiety, and ADHD masking

In this context, it is important to distinguish between two mechanisms of anxiety that have different clinical meanings, even if they are difficult for patients to separate.

Secondary anxiety appears as a reaction to ADHD symptoms. It is most often related to real-life consequences: forgetfulness, lateness, organizational difficulties, or mistakes. It is therefore, in a sense, “anchored” in experience and arises from anticipating recurring difficulties.

Primary anxiety, on the other hand, is more generalized. It is not directly dependent on situation or cognitive performance level. It manifests as persistent tension, a tendency to worry, and anticipation of threats across multiple areas of life simultaneously.

In clinical practice, these two types of anxiety often overlap, which further complicates diagnosis.

One of the most interesting phenomena in this area is the so-called masking of ADHD by anxiety. In some individuals, compensatory strategies develop that may superficially resemble high organization and self-discipline. These include perfectionism, excessive planning, strong behavioral control, or avoidance of risky situations.

From an external perspective, such a person may appear highly “structured.” However, the psychological cost of maintaining this structure is high — it requires constant cognitive and emotional tension. In many cases, ADHD is only diagnosed when compensatory strategies are no longer sufficient and anxiety is no longer an effective control mechanism.

Treatment and restoring regulation

Understanding this comorbidity has direct therapeutic implications. Treatment is not only about reducing symptoms of one disorder, but about improving the overall regulation of the cognitive-emotional system. In many cases, effective treatment of ADHD also reduces secondary anxiety, as it decreases the number of daily overwhelming situations.

Pharmacotherapy may include both stimulant and non-stimulant medications, and in selected cases also anti-anxiety or antidepressant treatment. The choice of strategy depends on the dominant clinical presentation and the individual patient response.

Psychotherapy is equally important, particularly cognitive-behavioral therapy, which allows work on both functional structure and worry mechanisms. Finally, basic factors such as sleep, daily rhythm, and sensory exposure also play a significant role, as they influence overall nervous system stability.

The co-occurrence of ADHD and anxiety is therefore not a random combination of two independent disorders. In many cases, it is a single, complex regulatory system operating under overload.

From the patient’s perspective, the key turning point is not the diagnosis itself, but the understanding that their experience does not result from a “character inconsistency,” but from a specific way their nervous system functions.

And this understanding often becomes the first real step toward improved functioning.