Anxiety or ADHD? Why They Look So Much Alike in Kids...and Why the Difference Matters

By Dr. McKinzie Duesenberg-Marshall, PhD, LP, NCSP | Minds in Progress, LLC

Your child's teacher has flagged concerns about focus. Maybe your child is shutting down during tests, avoiding social situations, or struggling to finish anything at home. You've Googled "signs of ADHD" and checked most of the boxes...but something feels off. Could it be anxiety? Could it be both?

You're not overthinking this. Anxiety and ADHD are genuinely difficult to tell apart in children, and even experienced clinicians find the differential challenging. Understanding why they overlap (and how to distinguish them) is one of the most important things a parent can know.

Why They Get Confused

On the surface, anxiety and ADHD can look almost identical:

• Trouble paying attention in class

• Difficulty completing assignments

• Restlessness and trouble sitting still

• Sleep problems

• Emotional outbursts or irritability

• Avoidance of tasks

  
  

When a child is anxious, their brain is essentially locked onto a perceived threat. That hypervigilance leaves little room for attention, follow-through, or calm. The result looks a lot like distractibility, which is why anxiety is one of the most common reasons a child gets referred for an ADHD evaluation, and also one of the most common reasons an ADHD diagnosis gets missed.

Making this even more complicated: roughly 50% of children diagnosed with ADHD also have a co-occurring anxiety disorder. These aren't always separate, competing explanations. Sometimes both are happening at once.

The Key Difference: Where the Attention Is Going

One of the most useful clinical questions isn't "Can this child focus?" It's "What is this child's attention doing?"

In ADHD, the attention system itself is dysregulated. A child with ADHD may struggle to sustain focus on almost anything that doesn't provide immediate engagement, novelty, or reward...regardless of whether they're worried about it.

They're not avoiding the homework because they're scared of failing. They're avoiding it because their brain isn't getting the neurological "signal" to stay with it. They can hyperfocus on video games for three hours and then completely blank on where they put their backpack.

In anxiety, the attention is being hijacked by worry. A child with anxiety may be entirely capable of sustained focus, but their mind keeps returning to the feared outcome. They're not distracted; they're preoccupied. The homework doesn't get done because the child is consumed by what happens if they get it wrong, not because they can't access the task.

A useful way to think about it: ADHD is a problem with attention regulation. Anxiety is a problem with what attention is stuck on.

How Each Condition Shows Up in Real Life

ADHD in children often looks like:

• Forgetting instructions moments after they were given

• Starting tasks easily but rarely finishing them

• Losing things constantly (backpack, homework, jacket — daily)

• Blurting out answers before a question is finished

• High energy in low-demand settings, then struggling hard in structured ones

• Impulsivity that gets them in social trouble (interrupting, grabbing, acting without thinking)

• Difficulty with transitions

• Variability — "good" days and "bad" days that seem random

  
  

Anxiety in children often looks like:

• Excessive worry about things going wrong (school, health, friendships, safety)

• Reassurance-seeking — asking the same "what if" questions repeatedly

• Avoidance of situations tied to the fear (refusing school, avoiding new experiences)

• Physical complaints (stomachaches, headaches) that get worse in anticipated situations

• Perfectionism — spending hours on one assignment because it has to be exactly right

• Sleep difficulty tied to worry thoughts at bedtime

• Clinging to familiar routines; distress when routines change

• Difficulty being away from parents or primary caregivers

  
  

The Complication: Secondary Anxiety in ADHD

Here's where it gets genuinely tricky. Children with ADHD frequently develop anxiety...not because they have an anxiety disorder, but because living with unmanaged ADHD is stressful.

When a child spends years forgetting assignments, losing things, misreading social cues, and getting in trouble despite trying hard, anxiety is often the natural result. They begin to anticipate failure. They avoid situations where they've struggled before. They become hypervigilant about the consequences of their executive function challenges.

This is called secondary anxiety, and it can look just as intense as primary anxiety. The important clinical question is which came first: the worry, or the ADHD-driven struggles that created something to worry about?

Getting this sequence right matters enormously for treatment. CBT targeting anxiety alone won't resolve the underlying ADHD. And treating ADHD without addressing the anxiety that's developed around it often leaves a child still stuck.

Why a Proper Evaluation Makes All the Difference

A pediatrician's checklist or a teacher's rating scale is a starting point...not a diagnosis. These tools can flag concern, but they can't distinguish ADHD from anxiety, identify which is primary, or detect when both are present.

A comprehensive psychoeducational or neuropsychological evaluation looks at the full picture: developmental history, cognitive functioning, executive function, attention across settings, social-emotional functioning, and input from multiple informants (parents, teachers, the child). It asks not just "are symptoms present?" but "what's driving them, and in what contexts?"

This matters because the treatment roadmap is different depending on what's actually going on:

• ADHD only: behavioral strategies, executive function support, parent coaching, and in many cases, medication. If autism is also a clinical question, an autism evaluation can help distinguish ASD-related executive function differences from ADHD or anxiety-driven patterns.

• Anxiety only: cognitive behavioral therapy (CBT), exposure-based work, and parent guidance

• Both: a sequenced or integrated approach that typically addresses both, often with anxiety first if it's severe enough to block the child's ability to engage in ADHD-related strategies

  
  

Starting with the wrong treatment, or treating only one when both are present, wastes time and can leave a child feeling like nothing works for them.

Why Girls and Kids with Inattentive ADHD Are So Often Missed

The anxiety-versus-ADHD differential is hard for everyone, but it's hardest, and the stakes are highest, for two groups in particular: girls and children with ADHD-Predominantly Inattentive presentation (ADHD-PI). These groups overlap significantly, and both are systematically underidentified. Understanding why matters a great deal for parents who've been told their child has anxiety and aren't sure the story is complete.

The Problem with How We Picture ADHD

For decades, the clinical and cultural picture of ADHD was a hyperactive boy who couldn't sit still, blurted out answers, and got sent to the principal's office. That image shaped everything — who got referred, which rating scales got developed, what behaviors teachers flagged, and who got evaluated early.

Girls with ADHD (and any child whose ADHD is predominantly inattentive rather than hyperactive) rarely match that picture. They're not disruptive. They're not in trouble. In fact, they often look like they're holding it together just fine, right up until they aren't.

The research bears this out clearly: boys are diagnosed with ADHD in childhood at a rate of roughly 3 or 4 to 1 compared to girls...yet by adulthood, the ratio equalizes to nearly 1:1. That gap doesn't mean girls have ADHD less often. It means they're being missed.

How Inattentive ADHD Looks Different

ADHD-Predominantly Inattentive type has none of the hallmarks most people associate with ADHD. There is no bouncing off the walls, no impulsive outbursts, no constant motion. Instead, the picture looks like this:

• Drifting mentally mid-conversation or mid-lesson — present in body, absent in mind

• Starting assignments but losing the thread before finishing

• Difficulty holding onto multi-step instructions (not because they weren't listening, but because working memory didn't hold them)

• Chronic disorganization — lost papers, forgotten due dates, a backpack that's a mystery to everyone, including its owner

• Taking much longer than peers to complete tasks, even ones that the child understands

• Appearing "spacey," unfocused, or "in their own world"

• Significant inconsistency — some days are fine; other days, the same task is impossible

  
  

None of these behaviors alarm anyone. Teachers often describe these children as bright but scattered, daydreamy, or "could do better if she just applied herself." What they rarely say is that they think the child has ADHD.

Why Anxiety Gets the Diagnosis Instead

Here's where it compounds. Inattentive ADHD and anxiety produce a nearly identical surface picture...a child who seems worried, avoids tasks, struggles to complete things, and appears emotionally fragile. The behavioral presentation is nearly the same. The underlying driver is different, but that difference isn't visible to the naked eye.

The inattentive child who can't organize their backpack, forgets assignments, and takes two hours to do twenty minutes of homework isn't anxious by nature, but they often become anxious as a consequence of living with undiagnosed ADHD. After years of knowing they're trying hard and still getting it wrong, anxiety is a predictable response. The anxiety then gets treated, the ADHD doesn't, and the child continues to struggle in ways that don't make sense given "successful" anxiety treatment.

For girls specifically, this pattern is compounded by what researchers call masking or the tendency to develop social and behavioral strategies that hide neurodivergent traits. Girls are socialized to be agreeable, attentive, and socially attuned. Many girls with ADHD apply enormous cognitive effort to appearing okay: they sit still, they make eye contact, they remember to smile, and they apologize when they forget things. They expend so much energy managing appearances that the underlying dysregulation stays invisible...until it doesn't. The breakdown often comes in middle school, when social demands increase, academic work requires sustained independent executive function, and masking becomes too expensive to maintain.

What Gets Missed and What It Costs

A girl with undiagnosed inattentive ADHD may spend years accumulating a diagnosis history that looks like this: anxiety (treated with therapy), depression (treated with medication), low self-esteem (attributed to personality), academic struggles (attributed to not trying). The ADHD, which was driving much of it from the beginning, never gets identified.

This isn't a hypothetical. Research consistently shows that girls with ADHD make more visits to mental health providers before receiving an ADHD diagnosis than boys do, meaning the wrong treatment often comes first, and comes repeatedly. Women who receive an ADHD diagnosis in adulthood frequently describe the experience as clarifying a lifetime of feeling broken in ways they couldn't explain.

The cost isn't just delayed treatment. It's years of a child believing something is fundamentally wrong with her — her effort, her character, her intelligence — when what she actually needed was an accurate diagnosis and the right support.

What to Watch For

If your child (particularly a daughter, or any child who is quiet, internally driven, and not a behavioral concern) has been diagnosed with anxiety but isn't fully responding to anxiety treatment, it's worth asking whether inattentive ADHD has been adequately ruled out. Specifically:

• Does your child struggle with follow-through and organization even when they're not in an anxious period?

• Do they lose track of things, forget steps in tasks, or have difficulty with time even on calm days?

• Has "anxiety treatment" reduced the worry but left the executive function struggles unchanged?

• Does your child work significantly harder than peers to produce the same output, and seem exhausted by it?

• Have teachers described your child as bright but underperforming, unfocused, or inconsistent...without flagging behavioral concerns?

  
  

These patterns don't confirm inattentive ADHD, but they suggest that anxiety alone may not be the complete picture. A comprehensive evaluation that specifically assesses attention, working memory, processing speed, and executive function (across both parent and teacher report and direct cognitive testing) is the only way to know for certain.

What You Can Do Right Now

If you're trying to get a clearer picture, a few questions worth sitting with:

1. Does your child worry excessively about specific outcomes, or do they just seem scattered and forgetful without particular fears attached?

2. Is the avoidance driven by fear of something going wrong, or do they just not start things and can't explain why?

3. Does your child have "good days" and "bad days" that seem unrelated to stress, or do their struggles track with anticipated situations?

4. Has anxiety treatment (therapy, accommodations for worry) helped, or is the picture still unclear?

   
   

These questions won't give you a diagnosis, but they can help you describe what you're seeing more precisely when you sit down with an evaluator.

Ready to Get Clarity?

If you've been going back and forth between ADHD and anxiety (or wondering if it might be both) a comprehensive evaluation is the most direct path to answers. At Minds in Progress, I specialize in psychoeducational and neuropsychological evaluations that take the full picture into account, including ADHD evaluation and co-occurring conditions like anxiety.

Families in St. Charles, O'Fallon, St. Peters, and across the greater St. Louis area are welcome for in-person evaluations, and I offer telehealth services across PSYPACT states.

You don't have to keep guessing. Reach out — I'd be glad to help you figure out what's actually going on.