When ADHD IS NOT ADHD

 As a young pediatric resident—before I went on to complete a pediatric neurology fellowship—I encountered my first patient referred for “ADHD” in clinic, and I was excited to evaluate him.

He was a 9-year-old boy whose symptoms certainly sounded consistent with ADHD on the surface: hyperactivity, impulsivity, poor focus, and difficulty sustaining attention. But as I spoke with his mother and examined him more carefully, it became clear that something was not adding up.

His mother was concerned about symptoms that did not fit neatly into a straightforward ADHD picture. She had noticed subtle but progressive problems: unusual eye movements, tremors, and spells of impaired awareness that later proved to be small seizures.

On examination, I found several neurological abnormalities that worried me. He had mild imbalance, tremors, difficulty walking, and an abnormal broad-based, wobbly gait. I also observed intermittent horizontal jerking eye movements called nystagmus, abnormal coordination with dysmetria or “past-pointing,” and unusually brisk reflexes. This did not look like “just ADHD.

”At the time, I was still a pediatric resident, not yet formally trained in neurology. But I felt strongly that we were dealing with something more than a behavioral or attention disorder. I brought my concerns to the supervising pediatric neurologist in town and suggested that we obtain a brain MRI.

Initially, my concern was dismissed. I was told that the child simply had ADHD with what were described as “soft neurological signs.” But I could not shake the feeling that something important was being missed. I pushed for imaging anyway.

Reluctantly, the MRI was approved.

A few days later, after the scan was completed at the hospital, that same neurologist called me to the radiology department right away. The MRI was strikingly abnormal, showing significant white matter changes in the posterior part of the brain. Additional testing was ordered, including very long-chain fatty acids. The sample was sent to Johns Hopkins.

The diagnosis came back: adrenoleukodystrophy.

That was my first encounter with this devastating neurodegenerative disorder. We did everything we could for that child, but despite the effort, he died several months later. I have never forgotten him.

That was my first encounter with this devastating neurodegenerative disorder. We did everything we could for that child, but despite the effort, he died several months later.
I have never forgotten him.

 What that first “ADHD” case taught me

That experience taught me lessons I have carried with me throughout my career.

1. Not everything that looks like ADHD is ADHD
Many children with ADHD-like symptoms truly do have ADHD. In fact, most do. ADHD is real, common, and often very treatable.
But sometimes, symptoms that resemble ADHD are actually a clue to something else entirely.
When attention problems, impulsivity, hyperactivity, irritability, or behavioral dysregulation appear alongside other concerning signs—especially progressive neurological changes—the clinician has to widen the lens.

2. Listen carefully to parents
Parents are often the first to notice that something is off.
They may not use medical language. They may not be able to explain exactly what they are seeing. But they often detect subtle changes before anyone else does: “His eyes move funny sometimes.” “He seems shakier.” “He zones out.” “His walking looks different.”
That kind of observation matters.
Good medicine requires more than pattern recognition. It requires listening.

3. A careful neurological exam still matters
In an era of checklists, questionnaires, and fast diagnoses, the neurological exam remains enormously important.
When a child with ADHD symptoms also has tremors, abnormal eye movements, gait imbalance, seizures, regression, coordination problems, or other unexpected findings, the evaluation should not stop at the label of ADHD.
That does not mean every child needs a brain MRI. It does mean that clinicians must think critically and work up what deserves to be worked up.

ADHD symptoms can come from more than one place
This early experience also forced me to become more open-minded about the many factors that can affect brain function and produce symptoms that resemble ADHD.
Sometimes the issue is primary ADHD. Sometimes it is not.
In some cases, ADHD-like symptoms may reflect:
  • Neurometabolic or neurogenetic disorders
  • Seizure-related conditions
  • Nutritional deficiencies
  • Sleep problems
  • Psychological stress or trauma
  • Poor diet and lifestyle-related contributors
  • Other neurological or medical disorders affecting brain function
This is one reason we believe in a broader, more thoughtful approach to evaluating attention and behavior concerns. The goal is not to overcomplicate every case. The goal is to avoid oversimplifying the wrong one.

Red flags that deserve a closer look
Most children with inattention or hyperactivity do not have a serious neurological disease. But clinicians and parents should pay attention when ADHD-like symptoms are accompanied by things such as:
  • Abnormal eye movements
  • Tremors
  • Episodes of staring or impaired awareness
  • Loss of skills or developmental regression
  • Imbalance or unusual gait
  • Coordination problems
  • Clear progression over time
  • Other abnormal neurological exam findings
Those are clues. And clues matter.

The bottom line
Most kids who present with ADHD symptoms will turn out to have benign or treatable causes, including straightforward ADHD. But in rare cases, something deeper may be going on.
That is why careful history-taking matters. Listening matters. Parental concerns matter. A thoughtful neurological exam matters.
And above all: never let a label stop you from thinking.
Because sometimes, “ADHD” is not ADHD.

Closing takeaway for parents and clinicians

If a child is struggling with attention, behavior, impulsivity, or hyperactivity, it is important to ask the right questions—not just, “Does this look like ADHD?” but also, “Is there anything here that doesn’t fit?”
That one question can change everything.

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