top of page

Psychological Encyclopedia

Anxiety and ADHD: Comorbidity, Restlessness, Attention, and Differential Diagnosis

Oct 1
23 min read

Updated: Oct 8

Author: Ukrainian Psychological Hub · Published: October 1, 2026 · Editorial Policy

 

Anxiety and attention-deficit/hyperactivity disorder (ADHD) can occur together, and they can also resemble one another in everyday life. Both can involve difficulty concentrating, restlessness, irritability, sleep disruption, procrastination, feeling mentally overloaded, and trouble completing tasks. That overlap is real, but it does not make anxiety and ADHD the same condition. Current diagnostic frameworks place ADHD among neurodevelopmental disorders, while anxiety disorders are a separate family of conditions defined by disorder-specific patterns of fear, anxiety, worry, and related behavior. The American Psychiatric Association describes ADHD within neurodevelopmental disorders, and the World Health Organization ICD-11 clinical manual likewise treats ADHD and anxiety disorders as distinct diagnostic entities.

 

The distinction matters because a shared symptom does not identify its cause. A person who cannot focus because intrusive worry is consuming attention is experiencing a different process from a person with a longstanding developmental pattern of inattention across multiple settings. A person who feels physically keyed up before a feared event may look restless for a different reason than someone whose hyperactivity or internal restlessness is part of ADHD. A third person may meet criteria for both. The clinical task is therefore not to choose whichever label best matches one symptom, but to reconstruct the pattern, timeline, triggers, settings, impairment, and co-occurring features.

 

 

Anxiety and ADHD Are Distinct, but They Commonly Meet in the Same Person

 

ADHD is a developmental disorder characterized by persistent patterns of inattention and/or hyperactivity-impulsivity that interfere with functioning. The pattern begins in childhood even when it is first recognized later. In adults, hyperactivity may be less visibly motoric and may be experienced as internal restlessness, difficulty remaining still, excessive activity, or a persistent need for stimulation. NIMH notes that ADHD symptoms begin in childhood and must affect functioning across multiple areas of life; CDC guidance for adults similarly emphasizes developmental history and the need to consider alternative explanations.

 

Anxiety is broader than an anxiety disorder. Anxiety can be a normal response to uncertainty, threat, performance demands, health concerns, conflict, or major life changes. It can also be a symptom within many mental and physical conditions. An anxiety disorder requires a disorder-specific clinical pattern in which fear, anxiety, worry, avoidance, or related behavior becomes excessive, persistent, distressing, or impairing in the way required by that diagnosis. NIMH distinguishes ordinary anxiety from anxiety disorders, while the World Health Organization describes anxiety disorders as conditions involving excessive fear and worry with significant distress or impairment.

 

Comorbidity means that two conditions are present in the same person and each is supported independently. It does not mean that every anxious person with ADHD has an anxiety disorder, that every person with an anxiety disorder who is distracted has ADHD, or that one diagnosis is merely a symptom of the other. The same principle applies to screening scores: a high anxiety score and a high ADHD score can justify closer assessment, but two elevated questionnaires do not by themselves establish two diagnoses.

 

How common is anxiety among people with ADHD?

 

The answer depends on age, population, sampling method, and what researchers measure. In children and adolescents with diagnosed ADHD, a 2025 systematic review and meta-analysis of 121 studies including 39,894 participants estimated that 18.4% had a comorbid anxiety disorder. The authors also found that the psychiatric conditions examined were generally more prevalent in ADHD samples than in the general population. Njardvik and colleagues' meta-analysis is one of the strongest recent summaries, but its pooled percentages are population estimates rather than predictions for an individual child.

 

In adults, the newest evidence also points to elevated anxiety, although studies differ substantially in how they define ADHD, which anxiety measures they use, and which comparison groups they select. A 2026 systematic review and meta-analysis of 58 case-control studies with 18,821 participants found higher anxiety symptom scores in adults with ADHD than in controls, with an average Hedges's g of 0.77. The effect was larger against nonclinical than clinical comparison groups, and the authors reported some evidence of publication bias. Hoskins, Gooch, and Gilligan-Lee therefore support a robust association with anxiety symptoms, not a universal comorbid-anxiety-disorder rate.

 

The practical conclusion is established: anxiety symptoms and anxiety disorders deserve deliberate assessment when ADHD is present, and ADHD deserves consideration when persistent attention or hyperactivity-impulsivity symptoms accompany anxiety. The exact proportion varies across populations, and comorbidity should be demonstrated rather than assumed.

 

Why Anxiety Can Look Like ADHD

 

Anxiety changes attention. When the brain is allocating resources to anticipated danger, uncertainty, bodily sensations, social evaluation, or repetitive worry, fewer resources may remain available for the task in front of the person. Someone may reread a paragraph without absorbing it, miss what another person said, forget the next step in a task, or seem mentally absent. These are genuine attention difficulties. Their presence alone does not establish ADHD.

 

Concentration problems

 

Concentration difficulty is especially easy to misread because it is explicitly compatible with anxiety presentations and also central to ADHD. In anxiety, attention may be captured by worry, threat monitoring, intrusive predictions, bodily sensations, or attempts to suppress distressing thoughts. Concentration may worsen in feared or uncertain contexts and improve substantially when the threat state settles. In ADHD, the pattern is typically broader and developmentally persistent: difficulties with sustained attention, organization, task completion, distractibility, and forgetfulness appear across time and in more than one relevant setting, even though severity still varies with interest, novelty, structure, sleep, and environmental demands.

 

A useful question is not simply “Can you concentrate?” but “When, where, since when, and under what conditions does concentration break down?” That is why formal assessment relies on developmental and contextual history rather than a single symptom checklist. NICE ADHD guidance requires a full clinical and psychosocial assessment, developmental and psychiatric history, and consideration of coexisting conditions; the American Academy of Pediatrics guideline likewise emphasizes impairment in more than one setting and assessment for comorbid emotional conditions.

 

Restlessness and feeling on edge

 

Restlessness can also arise through different routes. Anxiety can produce autonomic arousal, muscle tension, pacing, fidgeting, an urge to escape, and the subjective sense of being “on edge.” ADHD can involve motor hyperactivity, difficulty staying seated, frequent movement, excessive talking, or an adult form of internal restlessness. The visible behavior can converge while the surrounding pattern diverges.

 

Timing is informative. Anxiety-related restlessness often intensifies around feared outcomes, uncertainty, social scrutiny, bodily sensations, separation, or other anxiety-specific cues. ADHD-related restlessness is more likely to be woven into a longstanding pattern of activity regulation and impulse control across many contexts. Neither rule is absolute. A person with ADHD can become especially restless under stress, and a person with an anxiety disorder can feel persistently activated even when no immediate trigger is obvious.

 

Procrastination and avoidance

 

Both conditions can produce delay, but “procrastination” is a behavioral description rather than a diagnosis. Anxiety may drive delay because beginning a task brings feared evaluation, uncertainty, anticipated failure, uncomfortable bodily arousal, or a need to feel completely prepared. ADHD may contribute through task initiation difficulty, time blindness, distractibility, weak prospective memory, reward sensitivity, or trouble organizing a multistep project. When both are present, executive friction and anxiety-driven avoidance can reinforce each other.

 

The feared consequence often clarifies anxiety-related avoidance. A person may postpone sending an email because they fear being judged, avoid driving because they fear panic or losing control, or repeatedly delay a decision because uncertainty feels intolerable. ADHD-related delay can occur even when the task is not feared: the person intends to act, loses track of time, shifts to a more immediately rewarding activity, forgets the plan, or cannot organize the starting sequence. Real cases can contain both mechanisms.

 

Racing thoughts

 

“Racing thoughts” is a popular description, not a diagnosis and not a specific core criterion that cleanly separates ADHD from anxiety. Anxiety can involve rapid chains of “what if” predictions, threat simulations, reassurance loops, or repeated attempts to solve uncertain future problems. People with ADHD may describe rapidly shifting thoughts, competing ideas, distractibility, or difficulty regulating the stream of attention. Similar language can also occur in mood episodes, severe sleep deprivation, substance effects, and other states. The content, speed, episodic pattern, sleep need, associated mood changes, and developmental history all matter.

 

Sleep problems

 

Sleep can amplify both pictures. Worry can delay sleep onset or cause nighttime arousal; ADHD is also strongly associated with sleep difficulties, irregular routines, delayed sleep timing, and problems disengaging from stimulating activity. Sleep loss itself impairs attention, working memory, emotion regulation, and impulse control, creating a third source of ADHD-like or anxiety-like symptoms. This is one reason clinicians ask about sleep rather than assuming that daytime inattention belongs to either diagnosis.

 

Irritability and emotional overload

 

Irritability, frustration, and emotional overload can accompany anxiety and ADHD without being diagnostic by themselves. A meta-analysis of adults with ADHD found substantial emotion-dysregulation differences compared with healthy controls, supporting emotion regulation as an important associated clinical dimension. Beheshti and colleagues also emphasized that emotion dysregulation is associated with ADHD severity. Anxiety can independently increase irritability through sustained threat anticipation, poor sleep, physiological arousal, and avoidance. The symptom therefore needs context rather than ownership by one label.

 

Why ADHD Can Lead to Secondary Anxiety Without Making Anxiety a Symptom of ADHD

 

ADHD can create life conditions in which anxiety becomes understandable. Repeatedly missing deadlines, forgetting commitments, losing necessary items, receiving criticism, struggling academically, making impulsive mistakes, or feeling chronically behind can generate anticipatory worry. A child who repeatedly gets in trouble for forgotten work may become anxious before school. An adult who has missed several important appointments may become highly vigilant about the next one. These pathways are clinically plausible and supported by longitudinal associations, but they do not mean that ADHD automatically “causes” an anxiety disorder.

 

Longitudinal research suggests that the relationship can be developmentally interactive. In a community adolescent sample, Murray and colleagues reported reciprocal within-person relations between ADHD and anxiety symptoms across adolescence. In a preschool longitudinal study, Gair and colleagues found that earlier ADHD symptoms predicted later anxiety symptoms, whereas the reverse pathway was not supported in that particular sample. These studies support possible developmental influence while also showing why one simple causal story is inadequate.

 

The strongest wording is therefore: ADHD and anxiety can co-occur; ADHD-related impairment can contribute to experiences that foster anxiety; anxiety can worsen attention and executive functioning; and shared vulnerabilities may influence both. Whether any one person's anxiety arose because of ADHD requires more than temporal coincidence.

 

Shared Vulnerabilities and Mechanisms

 

Comorbidity can arise through several routes at once. Some people may have partially shared genetic liability. Others may develop anxiety secondarily to repeated functional problems. Anxiety may then worsen cognitive efficiency, sleep, and avoidance, increasing the apparent severity of ADHD. Environmental stressors can affect both conditions. The same person can therefore have overlapping symptoms produced by different mechanisms at different times.

 

Genetic overlap

 

Evidence supports partial genetic overlap between anxiety-related traits or disorders and ADHD, but genetic correlation is not genetic identity. In a genome-wide analysis of anxiety disorders and related phenotypes, Ohi and colleagues reported a positive genetic correlation between anxiety disorders and ADHD. This means some common genetic variation may contribute to liability for both; it does not provide a diagnostic test, determine an individual's outcome, or imply that the two conditions are one disorder.

 

Attentional control

 

Attentional control is another plausible bridge. Anxiety can bias attention toward threat and make disengagement from worry difficult. ADHD can disrupt top-down regulation of sustained attention and task goals. Research examining covariance between ADHD and anxiety symptoms suggests that attentional-control processes may explain part of their overlap, but not all of it. Mechanistic findings are useful for understanding comorbidity; they do not replace diagnostic assessment.

 

Stress, criticism, and functional consequences

 

Repeated failure experiences, unpredictable performance, interpersonal conflict, and chronic stress can become a learning environment for anxiety. At the same time, anxiety can generate avoidance and perfectionistic overcontrol that complicate already difficult executive tasks. The result can be a self-reinforcing cycle: disorganization increases uncertainty, uncertainty increases worry, worry consumes attention, reduced attention worsens performance, and poorer performance creates more reasons to worry.

 

This cycle is clinically meaningful even when only one formal diagnosis is present. Treatment planning can target the mechanisms that are actually maintaining impairment while diagnostic decisions remain based on the full syndrome.

 

The Most Useful Differential Clue Is the Pattern, Not the Symptom

 

No single symptom reliably separates anxiety from ADHD. The most informative evidence comes from the organization of symptoms across development, situations, triggers, and functions. A differential diagnosis asks which pattern best explains the person's difficulties and whether more than one pattern is independently present.

 

Developmental timeline

 

ADHD is developmental. Symptoms are expected to have roots in childhood even if diagnosis occurs much later. Adults sometimes recognize ADHD only when work, parenthood, higher education, or loss of external structure exceeds earlier coping capacity, but retrospective assessment still looks for earlier manifestations. NIMH's adult ADHD guidance and CDC's adult ADHD guidance both emphasize childhood onset and historical evidence.

 

Anxiety can begin in childhood, adolescence, or adulthood depending on the disorder and circumstances. If attention problems appeared only after a major escalation in anxiety, a period of insomnia, trauma-related symptoms, depression, substance use, or another medical or psychiatric change, clinicians should not simply infer previously hidden ADHD. Conversely, a clear childhood history of cross-situational inattention or hyperactivity-impulsivity does not disappear because the person later develops anxiety.

 

Cross-setting persistence

 

ADHD requires a pervasive pattern rather than difficulty in one narrow circumstance. School, home, work, relationships, finances, household tasks, and driving may reveal different aspects of the same developmental difficulty. Anxiety can also generalize broadly, but it often has a recognizable relationship to feared outcomes or worry themes. A student who loses focus only during oral presentations presents a different diagnostic problem from a student with years of forgetfulness, incomplete assignments, distractibility, disorganization, and impulsive interruptions across classes and home.

 

Trigger dependence

 

Anxiety-related impairment often intensifies when the feared possibility is salient: evaluation, uncertainty, illness, separation, bodily sensations, crowds, travel, or another disorder-specific domain. ADHD symptoms fluctuate too, especially with structure, novelty, immediate reward, fatigue, and task interest, but they do not need an anxiety trigger to exist.

 

Content of thought

 

Worry has content. It anticipates something going wrong and repeatedly attempts to prevent, predict, or mentally solve that possibility. ADHD-related distractibility can occur without a fear narrative: external stimuli, unrelated ideas, boredom, competing tasks, or immediate rewards pull attention away. Asking what the mind is doing during an “attention problem” often yields more information than measuring how distracted the person feels.

 

Functional signature

 

ADHD commonly creates chronic problems with organization, planning, sustained task effort, remembering obligations, time management, and impulse regulation. Anxiety commonly creates avoidance, reassurance seeking, safety behavior, hypervigilance, overpreparation, repeated checking of feared outcomes, or difficulty tolerating uncertainty. These are tendencies, not rigid rules. Comorbidity often produces a mixed functional signature.

 

Three Clinically Different Patterns

 

Pattern 1: Anxiety is the main explanation for the attention problem

 

Here, concentration and restlessness are closely tied to anxiety states. The person may function well cognitively when calm but lose focus during worry, social evaluation, panic-like arousal, uncertainty, or another anxiety-specific context. Attention improves when the anxiety process is reduced. There is little evidence of a persistent childhood-onset, cross-setting ADHD pattern. This can occur in normal anxiety as well as in a diagnosable anxiety disorder.

 

Pattern 2: ADHD is the main explanation and anxiety is secondary or subclinical

 

Here, a developmental pattern of inattention and/or hyperactivity-impulsivity is evident across years and settings. Anxiety may be situationally understandable—around deadlines, academic failure, conflict, or the consequences of forgetting—but it does not independently meet criteria for an anxiety disorder. Treating ADHD-related impairment and building reliable external supports may reduce some of the anxiety because fewer crises are generated.

 

Pattern 3: Both ADHD and an anxiety disorder are present

 

Here, the developmental ADHD pattern is independently supported, and a disorder-specific anxiety pattern is also present with its own triggers, cognitions, avoidance, duration, distress, or impairment. This is true comorbidity. For example, an adult may have lifelong disorganization and distractibility plus social anxiety characterized by persistent fear of scrutiny and avoidance. A child may have ADHD plus separation anxiety. Each condition requires its own formulation and evidence-based treatment decisions.

 

The narrower anxiety diagnoses retain their own boundaries. Broad “anxiety + ADHD” language should never erase whether the anxiety is generalized anxiety disorder, social anxiety disorder, separation anxiety disorder, panic disorder, agoraphobia, specific phobia, or another condition. If the main question is specifically generalized anxiety disorder, the dedicated GAD and ADHD page owns that differential. If the problem is fear of evaluation and social difficulty, see Social Anxiety vs ADHD.

 

Children and Adolescents

 

In children, context is indispensable because adults supply much of the developmental and cross-setting information. A child can look inattentive in a classroom because of ADHD, anxiety, learning difficulty, sleep loss, bullying, sensory overload, depression, language problems, medication effects, or a combination. A quiet anxious child may be missed because the behavior is less disruptive; a highly active child may have anxiety overlooked because hyperactivity captures attention.

 

Current pediatric ADHD guidance therefore requires evaluation beyond a single informant or setting. The American Academy of Pediatrics recommends screening for comorbid emotional or behavioral conditions, including anxiety and depression, as well as developmental and physical conditions. Njardvik et al. found anxiety disorders in a substantial minority of youth with ADHD, reinforcing the need for systematic comorbidity assessment.

 

School behavior can be misleading

 

An anxious student may stare out the window because they are mentally rehearsing a feared presentation. Another may repeatedly ask to visit the nurse because bodily sensations feel dangerous. A student with ADHD may miss instructions even when emotionally comfortable, forget homework repeatedly, lose materials, interrupt, or shift activity before completion. A child with both may show all of these patterns, and anxiety may be especially intense after repeated ADHD-related school failures.

 

Parent and teacher reports may differ

 

Differences across observers are not automatically evidence that one observer is wrong. Demands, structure, relationships, noise level, task type, and anxiety triggers vary by setting. Clinicians ask what each setting requires and what the child actually does there. A rating scale can organize these observations, but diagnostic reasoning still requires the pattern behind the score.

 

Treatment evidence in youth

 

Treatment should stay condition-specific. A secondary analysis of 842 children receiving cognitive behavioral therapy for a primary anxiety disorder found that mild-to-moderate, nonprimary ADHD did not predict poorer anxiety-treatment response or remission. Gould and colleagues support the practical point that anxiety-focused CBT can still be effective when ADHD symptoms are present, while their findings should not be stretched to children whose ADHD is severe, primary, or untreated.

 

Adults

 

Adults often reach assessment after years of compensating. Anxiety can become part of that compensation: excessive checking, overpreparing, arriving extremely early, maintaining elaborate reminder systems, or working much longer than peers to prevent mistakes. Those behaviors can conceal underlying ADHD while simultaneously creating distress. The opposite can also happen: an adult who has always been distractible may attribute every attention problem to ADHD even after a new anxiety disorder develops.

 

Adult assessment therefore reconstructs childhood and adolescence, not merely current productivity. School reports, family recollections, early patterns of losing belongings, unfinished work, impulsivity, chronic lateness, or difficulty sustaining attention can be informative when available. At the same time, clinicians assess current anxiety symptoms, onset, feared outcomes, avoidance, medical history, sleep, substance use, mood symptoms, and functional impairment.

 

The 2026 adult meta-analysis by Hoskins and colleagues strengthens the evidence that adults with ADHD report more anxiety symptoms on average. It does not tell a clinician whether a particular adult has generalized anxiety disorder, social anxiety disorder, panic disorder, or another anxiety diagnosis. That distinction remains clinical.

 

Screening Is Useful, but Scores Do Not Diagnose Either Condition

 

Anxiety and ADHD questionnaires answer narrower questions than a diagnostic evaluation. An anxiety scale may estimate symptom severity or flag people who could benefit from further assessment. An ADHD checklist may quantify inattentive or hyperactive-impulsive symptoms. Neither can determine, by itself, whether symptoms are developmentally persistent, present across appropriate settings, better explained by another condition, or severe enough to satisfy all diagnostic requirements.

 

The same caution applies when two screens are elevated. Anxiety can inflate endorsement of concentration, restlessness, and sleep items; ADHD-related impairment can increase distress and worry. A clinician uses scores as one data stream among developmental history, psychiatric history, functional impairment, context, observer information, and differential diagnosis. For the broader workflow, see How Is Anxiety Diagnosed? Assessment, History, and Differential Diagnosis.

 

This distinction is consistent with NIMH ADHD guidance, which describes rating scales and symptom checklists as components of evaluation alongside history and differential assessment, and with NICE guidance, which states that ADHD diagnosis should not be made solely on the basis of rating scales or observational data.

 

How Clinicians Assess Anxiety and ADHD Together

 

1. Reconstruct the timeline

 

Assessment asks when attention, activity regulation, worry, avoidance, and impairment first became noticeable. ADHD requires a developmental pattern. Anxiety may precede, follow, or emerge alongside ADHD. A sharp change after a new stressor, medical illness, medication, substance use pattern, mood episode, or severe sleep disruption deserves separate evaluation.

 

2. Map symptoms across settings

 

The clinician compares home, school, work, social situations, independent tasks, structured tasks, and high-anxiety situations. Symptoms that occur everywhere tell a different story from symptoms that cluster tightly around one feared context. The map also helps identify environmental supports that may have masked earlier ADHD.

 

3. Identify the function of avoidance and delay

 

Avoiding because a task is boring, difficult to organize, or easy to forget differs from avoiding because the task predicts humiliation, panic, contamination, separation, catastrophe, or another feared outcome. The behaviors can coexist. Functional analysis helps determine which process needs treatment.

 

4. Gather collateral information when appropriate

 

Childhood records, parent reports, teacher observations, partner observations, and prior evaluations can improve confidence when available. Collateral information is especially useful when adult recall is incomplete or when behavior varies by setting. It is evidence to integrate, not a vote that automatically overrides the person's own account.

 

5. Evaluate impairment

 

Symptoms become clinically meaningful through their persistence, severity, developmental appropriateness, and consequences. Clinicians ask what is happening to education, work, relationships, finances, self-care, driving, sleep, and daily functioning. High symptom counts with little impairment and major impairment with seemingly modest symptom counts both require interpretation rather than mechanical scoring.

 

6. Check for competing and co-occurring explanations

 

Sleep disorders, depression, bipolar-spectrum states, trauma-related disorders, obsessive-compulsive phenomena, autism, learning disorders, substance use, medication effects, and medical conditions can contribute to restlessness or attention problems. Sudden-onset symptoms are particularly important because developmental ADHD does not ordinarily begin abruptly in adulthood. The WHO ICD-11 CDDR explicitly emphasizes developmental persistence and differential diagnosis for ADHD. For a broader anxiety differential, see Anxiety Differential Diagnosis: What Can Look Like an Anxiety Disorder?.

 

OCD and PTSD are especially important semantic neighbors because both may include anxiety, concentration problems, arousal, or avoidance, yet neither should be turned into a subtype of anxiety disorder in current classification. Our separate page on Anxiety and PTSD explains the trauma-linked boundary.

 

Treatment When Anxiety and ADHD Co-Occur

 

There is no universal rule that one condition must always be treated first. Treatment planning depends on which symptoms are most impairing, whether one condition is destabilizing the treatment of the other, age, safety, patient preferences, previous response, comorbidities, and the evidence base for the specific diagnoses involved. A plan may address both conditions sequentially or in parallel.

 

ADHD medication does not automatically worsen anxiety

 

A common internet claim says that stimulant medication necessarily makes anxiety worse. The evidence does not support that as a universal rule. NICE recommendation 1.7.18 advises offering people with ADHD and an anxiety disorder the same ADHD medication choices as other people with ADHD. That does not mean anxiety can never worsen in an individual; it means comorbid anxiety is not, by itself, a reason to assume standard ADHD medication options are inappropriate.

 

In a meta-analysis of 23 randomized placebo-controlled psychostimulant trials involving 2,959 children with ADHD, Coughlin and colleagues found a lower reported risk of anxiety with psychostimulants than with placebo overall. The authors explicitly noted that some individual children can still experience increased anxiety. A later meta-analytic review found that anxiety outcomes were poorly reported in many pediatric ADHD drug trials, limiting certainty. Treatment therefore requires monitoring rather than a blanket prediction.

 

Atomoxetine has also been studied in children and adolescents with ADHD plus mixed anxiety disorders. In a randomized placebo-controlled trial, Geller and colleagues reported improvement in both ADHD and anxiety measures. Because the anxiety sample combined generalized anxiety disorder, separation anxiety disorder, and social phobia under older diagnostic criteria, the result should not be converted into proof that atomoxetine is a dedicated treatment for any one anxiety disorder.

 

The combined pharmacotherapy literature remains narrower than many online summaries imply. Villas-Boas and colleagues identified only a small number of controlled medication trials specifically focused on ADHD with comorbid anxiety. This is a useful evidence boundary: standard ADHD treatments have a strong ADHD evidence base, but the optimal sequencing and combined strategy for every ADHD-plus-anxiety presentation is less definitively established.

 

Anxiety treatment should remain disorder-specific

 

If the person has a specific anxiety disorder, treatment should follow evidence for that disorder rather than for “anxiety” as a generic category. CBT and exposure-based methods have strong roles across several anxiety disorders, but the exact targets differ. Social anxiety exposure addresses feared scrutiny and avoidance; panic-focused treatment can include interoceptive exposure; generalized anxiety treatment addresses persistent worry and related processes; separation anxiety treatment has developmentally specific components. Evidence from one disorder should not be silently transferred to another.

 

When ADHD is present, therapy may need practical adaptations: clearer structure, shorter task steps, written plans, reminders, repetition of homework instructions, and active review of whether assignments were actually completed. These adaptations are clinically plausible ways to improve treatment implementation, but the evidence for a specific adaptation can be thinner than the evidence for the core anxiety intervention itself.

 

ADHD treatment can reduce secondary anxiety in some people

 

If anxiety is partly driven by repeated ADHD-related crises, improving ADHD symptoms and daily systems may reduce the number of situations that trigger worry. Better time management, fewer missed commitments, more reliable task completion, and reduced impulsive mistakes can lower real-world uncertainty. That improvement should not be confused with treating a separate anxiety disorder if one remains.

 

Anxiety treatment can improve apparent attention problems

 

If attention is being consumed by worry, threat monitoring, panic-related vigilance, or avoidance, effective anxiety treatment may improve concentration even when no ADHD treatment is used. Improvement supports the formulation but does not retrospectively prove that ADHD was absent; people with both conditions may show partial improvement in attention while developmental ADHD symptoms remain.

 

Practical Supports While Assessment or Treatment Is Underway

 

Support can target observable problems before every diagnostic question is settled. Externalizing memory through calendars and reminders, breaking large tasks into visible steps, reducing avoidable sleep disruption, creating consistent places for important items, and using predictable routines can reduce executive load. Anxiety-focused self-monitoring can identify triggers, feared predictions, reassurance loops, avoidance, and safety behaviors. These strategies are supportive tools, not diagnostic tests.

 

For children, useful supports may involve consistent school-home communication, clear instructions, predictable transitions, and accommodations based on documented functional needs. For adults, workplace or academic supports may include written instructions, reduced distraction where feasible, structured deadlines, and planning systems. The relevant accommodation follows functional impairment and local policy rather than a label alone.

 

When to Seek a Professional Assessment

 

Assessment is worth considering when attention problems, hyperactivity or restlessness, worry, fear, or avoidance are persistent and meaningfully interfere with school, work, relationships, sleep, driving, finances, or daily responsibilities. It is particularly useful when symptoms have been present for years, when several explanations seem plausible, when previous treatment helped only part of the problem, or when a person is considering medication.

 

New or abrupt cognitive and behavioral changes deserve broader medical and psychiatric consideration. Severe sleep loss, substance effects, medication changes, thyroid or other medical problems, mood episodes, and neurological conditions can alter attention or arousal. Online symptom matching cannot safely resolve these possibilities. A clinician can decide which history, examination, or targeted tests are appropriate.

 

For the broad symptom map, see Anxiety Symptoms: Emotional, Cognitive, Physical, and Behavioral Signs. For how clinicians distinguish anxiety from other psychiatric, medical, substance-related, and stress-related presentations, see Anxiety Differential Diagnosis.

 

What the Evidence Establishes — and What It Does Not

 

Established evidence

 

ADHD and anxiety disorders are distinct diagnostic entities; they can co-occur; anxiety is more common in ADHD populations than in many comparison populations; overlapping symptoms can complicate diagnosis; developmental history, cross-setting functioning, and differential assessment are central to ADHD diagnosis; and screening scores are not sufficient for diagnosis. Evidence also supports standard ADHD treatment options in people with comorbid anxiety rather than a blanket medication prohibition.

 

Evidence that is strong but context-dependent

 

Meta-analyses support elevated anxiety symptoms in adults with ADHD and substantial anxiety-disorder comorbidity in youth with ADHD. The exact prevalence varies because studies differ in ascertainment, diagnostic methods, age, referral setting, and comparator. These findings justify systematic assessment, not a universal percentage applied to every person.

 

Plausible and partially supported mechanisms

 

Shared genetic liability, attentional-control difficulties, repeated ADHD-related failure experiences, chronic stress, anxiety-driven avoidance, and reciprocal developmental effects can all contribute to overlap. Different mechanisms may dominate in different people. Mechanistic evidence should guide hypotheses and treatment formulation without being treated as a diagnostic biomarker.

 

Claims that remain too simple

 

“If you can focus when calm, it is anxiety, not ADHD,” “If you have ADHD, your anxiety is caused by ADHD,” “Stimulants always worsen anxiety,” and “A high anxiety plus ADHD screening score means you have both disorders” are all too categorical. Real diagnostic reasoning requires the whole pattern.

 

Frequently Asked Questions

 

Can anxiety look like ADHD?

 

Yes. Anxiety can cause distractibility, concentration problems, restlessness, sleep disruption, irritability, and avoidance that may resemble parts of ADHD. The difference is established through developmental history, triggers, cross-setting persistence, associated symptoms, and functional pattern rather than one shared symptom.

 

Can ADHD cause anxiety?

 

ADHD-related impairment can contribute to anxiety through repeated stress, uncertainty, criticism, missed obligations, academic or work difficulties, and interpersonal consequences. Longitudinal research supports developmental links, but ADHD does not automatically cause an anxiety disorder. Shared vulnerabilities and independent anxiety pathways also matter.

 

Can you have both anxiety and ADHD?

 

Yes. Comorbidity is well documented in children, adolescents, and adults. Having both means that the ADHD pattern and the anxiety disorder are each independently supported rather than one diagnosis being inferred from the other.

 

How can you tell anxiety from ADHD inattention?

 

Clinicians look at onset, childhood history, settings, triggers, thought content, organization problems, avoidance, impairment, sleep, mood, substances, medical factors, and reports from people who know the person in different contexts. Anxiety-related inattention is often tied to worry or threat processing; ADHD inattention is typically a broader developmental pattern.

 

Are racing thoughts ADHD or anxiety?

 

They can occur in either description and are not specific enough to diagnose either condition. Anxiety often produces chains of threat-focused “what if” thinking; ADHD can involve rapidly shifting thoughts and distractibility. Racing thoughts can also occur in other states, so the wider clinical context matters.

 

Does ADHD medication make anxiety worse?

 

Not necessarily. Pediatric randomized-trial meta-analysis does not support a universal increase in anxiety with psychostimulants, and NICE does not recommend withholding standard ADHD medication choices solely because an anxiety disorder is present. Individual responses still vary and should be monitored by the prescribing clinician.

 

Does treating ADHD also treat an anxiety disorder?

 

Sometimes anxiety improves when ADHD-related impairment improves, especially when worry is secondary to repeated executive-function failures. A separate anxiety disorder may still require its own evidence-based treatment. Improvement in one condition does not erase the other.

 

Can anxiety treatment improve concentration?

 

Yes, when concentration is being disrupted by worry, threat monitoring, panic-related vigilance, avoidance, or poor sleep. That improvement can be clinically informative, but it does not by itself rule out co-occurring ADHD.

 

Can an online test diagnose anxiety and ADHD?

 

No. Online questionnaires can screen for symptoms or measure severity, but diagnosis requires clinical assessment, history, impairment, context, and differential diagnosis. Two positive screens do not automatically equal two diagnoses.

 

Which should be treated first, anxiety or ADHD?

 

There is no universal sequence. Clinicians consider severity, safety, impairment, patient goals, age, comorbidities, previous response, and how one condition affects treatment of the other. Some people benefit from parallel treatment; others need a staged plan.

 

Related Articles

 

 

 

 

 

 

 

 

 

 

 

References

 

American Psychiatric Association. Neurodevelopmental disorders.

 

Beheshti, A., Chavanon, M.-L., & Christiansen, H. (2020). Emotion dysregulation in adults with attention deficit hyperactivity disorder: a meta-analysis. BMC Psychiatry, 20, 120. https://doi.org/10.1186/s12888-020-2442-7

 

Centers for Disease Control and Prevention. (2026). ADHD in adults.

 

Coughlin, C. G., Cohen, S. C., Mulqueen, J. M., Ferracioli-Oda, E., Stuckelman, Z. D., & Bloch, M. H. (2015). Meta-analysis: Reduced risk of anxiety with psychostimulant treatment in children with attention-deficit/hyperactivity disorder. Journal of Child and Adolescent Psychopharmacology, 25(8), 611–617. https://doi.org/10.1089/cap.2015.0075

 

Faraone, S. V., et al. (2021). The World Federation of ADHD International Consensus Statement: 208 evidence-based conclusions about the disorder. Neuroscience & Biobehavioral Reviews, 128, 789–818. https://doi.org/10.1016/j.neubiorev.2021.01.022

 

Gair, S. L., Brown, H. R., Kang, S., Grabell, A. S., & Harvey, E. A. (2021). Early development of comorbidity between symptoms of ADHD and anxiety. Research on Child and Adolescent Psychopathology, 49(3), 311–323. https://doi.org/10.1007/s10802-020-00724-6

 

Geller, D., et al. (2007). Atomoxetine treatment for pediatric patients with attention-deficit/hyperactivity disorder with comorbid anxiety disorder. Journal of the American Academy of Child & Adolescent Psychiatry, 46(9), 1119–1127.

 

Gould, K. L., Porter, M., Lyneham, H. J., & Hudson, J. L. (2018). Cognitive behavioral therapy for children with anxiety and comorbid attention-deficit/hyperactivity disorder. Journal of the American Academy of Child & Adolescent Psychiatry, 57(7), 481–490.e2. https://doi.org/10.1016/j.jaac.2018.03.021

 

Grogan, K., et al. (2018). Differential diagnosis and comorbidity of ADHD and anxiety in adults. British Journal of Clinical Psychology, 57(1), 99–115. https://doi.org/10.1111/bjc.12156

 

Hoskins, J. I., Gooch, D., & Gilligan-Lee, K. A. (2026). Symptoms of anxiety in adults with ADHD: A systematic review and meta-analysis of case-control studies. Journal of Attention Disorders, 30(10), 1305–1337. https://doi.org/10.1177/10870547261459712

 

Murray, A. L., et al. (2022). Reciprocal developmental relations between ADHD and anxiety in adolescence. Journal of Attention Disorders, 26(1), 109–118. https://doi.org/10.1177/1087054720908333

 

National Institute for Health and Care Excellence. (2018, updated). Attention deficit hyperactivity disorder: diagnosis and management (NG87).

 

National Institute of Mental Health. Anxiety disorders.

 

 

Njardvik, U., Wergeland, G. J., Riise, E. N., Hannesdottir, D. K., & Öst, L.-G. (2025). Psychiatric comorbidity in children and adolescents with ADHD: A systematic review and meta-analysis. Clinical Psychology Review, 118, 102571. https://doi.org/10.1016/j.cpr.2025.102571

 

Ohi, K., et al. (2020). Shared genetic etiology between anxiety disorders and psychiatric and related intermediate phenotypes. Psychological Medicine. https://doi.org/10.1017/S003329171900059X

 

Villas-Boas, C. B., Chierrito, D., Fernandez-Llimos, F., Tonin, F. S., & Sanches, A. C. C. (2019). Pharmacological treatment of attention-deficit hyperactivity disorder comorbid with an anxiety disorder: A systematic review. International Clinical Psychopharmacology, 34(2), 57–64. https://doi.org/10.1097/YIC.0000000000000243

 

 

 

World Health Organization. Anxiety disorders.

 

Zhang, Y., Liao, W., Rao, Y., Gao, W., & Yang, R. (2025). Effects of ADHD and ADHD medications on depression and anxiety in children and adolescents: A systematic review and meta-analysis. Journal of Psychiatric Research, 181, 623–639. https://doi.org/10.1016/j.jpsychires.2024.12.022

 
 
bottom of page