Before you call it ADHD: Find the child at eight

A 13-year-old girl is brought in because her grades have collapsed. Her teachers say she cannot focus, she forgets assignments, and she stares out the window. A rating scale comes back positive. The question on the table is whether to start a stimulant.

Before answering it, I ask one thing: what was she like at 8?

Trouble concentrating is one of the least specific symptoms in medicine. Anxiety causes it. Depression causes it. Trauma, poor sleep, cannabis, family chaos, bullying, and ordinary overload all cause it. ADHD causes it too, but ADHD is different from all of those in one decisive way: it is a neurodevelopmental disorder. It begins as the brain develops. It does not switch on in seventh grade. So when the complaint is poor concentration, the diagnosis rests less on how the child looks today than on the story of how the child has developed.

What the diagnosis requires

Three things have to be present. The characteristic problems must have begun in childhood; DSM-5 requires several symptoms before age 12. They must show up in more than one setting, because ADHD is pervasive: school, home, activities, friendships. And they must cause real impairment, not the ordinary distractibility of childhood. A child who struggles in one classroom may be in a chaotic classroom, may hate the subject, or may be worried about something at home.

The questions that matter

The developmental history is not background. It is the diagnosis. What happened when a teacher gave 3 instructions at once? Could the child finish classwork and homework without someone sitting beside them? Were assignments constantly lost or forgotten? Did report cards say daydreaming, rushing, careless mistakes, out of seat, talks too much? Did parents see the same things at home, at the dinner table, at religious services, on the soccer field?

Anchor the answers in something sturdier than memory. With a child, this is usually possible: the parent is in the room and often has old report cards. Use them. And watch for retrospective drift, in parents as well as patients. Once a family believes a child has ADHD, ordinary childhood can be reread as evidence. Every child procrastinated sometimes. Every child was bored in some classes. What you are looking for is weight: repeated teacher concerns, across years and settings, with consequences.

The eighth-grade diagnosis

In my work as a child and adolescent psychiatrist, one pattern is so common that I have come to expect it: an ADHD diagnosis made for the first time around seventh or eighth grade, or in high school.

Sometimes this is real. Some children with genuine ADHD compensate through elementary school through intelligence, structure at home, or a forgiving classroom, and they decompensate only when middle school brings multiple teachers, long-term projects, and far more independence. Clinicians should know this pattern exists.

But at least as often, and in my experience more often, the history tells a different story. The child did well. Nobody ever raised a concern about attention. Then, in seventh or eighth grade, something happened: a hard transition to middle school, a falling out with friends, bullying, a parental divorce, a move, sometimes a sexual assault the family does not yet know about. In high school, the list grows to include cannabis and other substances, delinquency, and the pull of a new peer group. Grades fall, everyone is alarmed, and the search for a medical explanation ends at ADHD.

The best longitudinal data support the skepticism. Sibley and colleagues followed children from the Multimodal Treatment Study of ADHD local normative comparison group, assessing them repeatedly from ages 10 to 25 using parent, teacher, and self-reports. Of those who screened positive for late-onset ADHD on symptom checklists, roughly 95% were excluded once the full picture was examined; impairing symptoms most often appeared only in the context of heavy substance use or were better explained by another disorder.¹ A birth cohort followed into midlife found much the same in adults: most who met adult symptom criteria had not had ADHD as children.²

So when a first diagnosis appears in adolescence, ask what the child was like before the divorce, before the bullying, before the cannabis. Very often the answer is that there were no problems at all.

When there were attention problems early

The harder case is the child who really did struggle with attention in the early grades. Even then, keep taking the history.

Many children with early attention problems have also lived with trauma, anxiety, or chaos at home, and these produce inattention and dysregulation that can look identical to ADHD. One discriminator I rely on is looking for other markers of neurodevelopmental difference: a learning disability, a language or motor delay, or low-average or borderline intellectual functioning. When those are present, a genuine attention deficit is likely, because once neurodevelopmental difficulties reach a moderate range, attention problems are almost always part of the picture. When there are no other markers, and the attention problems rise and fall with the trauma or the household, the case for ADHD is much weaker.

A related pearl: most children with severe anxiety will meet criteria for ADHD on a rating scale. An anxious child cannot sit still, cannot concentrate, cannot follow instructions, and fidgets, avoids, and forgets. Treat the anxiety, and the “ADHD” very often goes with it.

A good response to a stimulant proves nothing

Families and clinicians often treat improvement on a stimulant as confirmation. It is not. Stimulants improve sustained attention and alertness in nearly everyone. Rapoport and colleagues showed this almost 50 years ago in typically developing boys given a single dose of dextroamphetamine.³ The drug does not check for the disorder before it works. A good report card on methylphenidate tells you the medication is active, not what the diagnosis is.

Prescribing with care

When the diagnosis is sound, stimulants can be transformative, and children who need them should get them. A few principles have served me well:

Prescribe for impairment, not for the label. A child with mild symptoms and a supportive school may need accommodations more than medication.

Start with methylphenidate. Amphetamine products are more often diverted, and adolescents are surrounded by peers who would like them.

Ask about cannabis, directly and alone with the teenager. Regular use clouds the diagnosis, and no assessment of attention can be trusted until it stops. I do not start a stimulant in an adolescent who is actively using.

Revisit the diagnosis at transitions. A child diagnosed after a hard year deserves a fresh look once the year is over.

The habit

ADHD is real, heritable, and treatable, which is exactly why the diagnosis deserves protection. Poor concentration is not ADHD. A positive rating scale is not ADHD. A good week on a stimulant is not ADHD. ADHD is a story that begins in early childhood and shows up wherever the child goes. Before you call it ADHD, find the child at 8. If the story is there, the diagnosis is usually clear. If it is not, something else is going on, and that is what the child needs you to find.

References

1. Sibley MH, Rohde LA, Swanson JM, et al. Late-onset ADHD reconsidered with comprehensive repeated assessments between ages 10 and 25. Am J Psychiatry. 2018;175(2):140-149. doi:10.1176/appi.ajp.2017.17030298

2. Moffitt TE, Houts R, Asherson P, et al. Is adult ADHD a childhood-onset neurodevelopmental disorder? evidence from a four-decade longitudinal cohort study. Am J Psychiatry. 2015;172(10):967-977. doi:10.1176/appi.ajp.2015.14101266

3. Rapoport JL, Buchsbaum MS, Zahn TP, et al. Dextroamphetamine: cognitive and behavioral effects in normal prepubertal boys. Science. 1978;199(4328):560-563. doi:10.1126/science.341313