A guest article by Dr Emma Bede of Willow Psychology. It grew out of a correspondence with Louise about a pattern we both see, and both recognise. It is general information for clinicians and for anyone trying to make sense of their own history, not a diagnosis, and not a substitute for a proper assessment. The person described below is a composite; no real client is identifiable in it.
Here is a pattern I am asked about often. A bright adult with a predominantly inattentive presentation and a high IQ comes for help with a life that has quietly stopped working. On careful assessment the adult picture is unmistakable: trouble starting and finishing things, losing the thread, a day that dissolves without the right thing getting done, and a sense of surviving on bursts of last-minute effort. The impairment is clearly there now, and was clearly there through the self-directed years of late adolescence and university. And yet, when you ask about childhood, there is almost nothing to point to before about the age of twelve.
A composite version: a girl who was two years ahead of her peers, at or near the top of every class, in a home and a school that supplied an unusual amount of structure, direction and challenge. No one ever recorded a difficulty, because under those conditions there was none to see. Then the scaffolding came away (the move to A-levels, then to a university that expected her to organise her own time), and within a year or two she went from the top of her cohort to barely holding on, often with a serious dip in mood alongside. The reports and the informant accounts from childhood say nothing. That silence is consistent with difficulties that were concealed by the environment. It does not, on its own, prove they were there.
A word on who this happens to. In my own practice these referrals have skewed towards men, but I am cautious about reading much into that, because it reflects who gets noticed and sent on as much as who has the difficulty. Bright girls and women with inattentive ADHD are among the most reliably missed people in the whole area. The inattentive presentation is quiet rather than disruptive, so it rarely troubles a classroom, and the supportive, high-expectation environments that conceal it in boys are often even better at smoothing it over in girls, who are praised for being conscientious and capable right up until they are quietly drowning. I have made the composite above a woman on purpose: if this pattern reads as something that happens to men, that assumption is part of the reason it is missed in everyone else.
Why the criteria struggle with this
Part of the difficulty is structural. The diagnostic criteria for ADHD were built around children, and have only been lightly adapted for adults. The DSM requires that several symptoms were present before the age of twelve, raised from age seven in the previous edition because the earlier cut-off was missing too many people, but the criteria still lean on a childhood template and on retrospective recall. The international consensus statements on adult ADHD make the same point from the other side: adult ADHD is substantially under-recognised, the childhood-onset requirement is hard to apply well, and diagnosis should weigh current functioning alongside whatever childhood information can be gathered rather than resting on it.
Retrospective recall is also unreliable. Adults' memories of their own childhood symptoms correlate only moderately with what was recorded at the time, and a meaningful proportion of adults with a documented childhood diagnosis will later say they had no childhood difficulties at all. So a "clean" early history is weaker evidence than it looks, especially for someone whose early environment was built, without anyone intending it, to keep difficulties from ever surfacing.
How I reason about it
None of this lets you manufacture a childhood that was not observed. But there are a few moves I find useful.
First, ask what better hypothesis there is. A trajectory of not just competence but excellence under supportive conditions, followed by a steep drop the moment the person had to self-direct, is a shape that needs an explanation. In the absence of one that fits better, ADHD that did not cause visible problems while the person was heavily supported is a strong candidate. It is worth entertaining the alternatives (depression alone, a different learning profile, situational stress) rather than reaching for ADHD by default; it is just that, often, none of them account for the whole curve as well.
Second, explore the conditions. I find it helpful to ask: under what conditions could you perform the way you did at your best, and what was different when it fell away? Many people can name it precisely: the structure someone else used to provide, the deadlines that were externally set, the difficulty now in organising, prioritising, or feeling the passage of time. Naming that as the obstacle between the capability and the output is often the moment it reframes from a character failing into something recognisable as attention and executive function. This is Barkley's long-standing framing of ADHD as a disorder of performance rather than of knowledge or ability: the problem is not knowing what to do, but reliably doing it at the point of performance.
Third, and I would flag this as clinical reasoning rather than a diagnostic rule,
I treat the need for external structure well in excess of what is normal for someone's age and ability as itself worth taking seriously as evidence. The diagnostic manuals define impairment in terms of interference with functioning, not relative to a person's ability or to how much scaffolding they quietly required, so this is an inference, not a formal standard. But it is a reasonable one. If someone could only produce their obvious potential while leaning on a level of support that most of their equally able peers did not need, the support was doing real work, and the fact that it was simply there, never asked for, can make the dependence easier to miss, not less real.
Fourth, keep the present in view. Whatever the truth of the childhood question, the here-and-now picture is often most helpfully understood through the lens of ADHD, and that understanding tends to open the door to strategies, accommodations, and sometimes a medication trial that can be revealing in its own right. (Many prescribers, reasonably, do not like to frame medication as a diagnostic test, so that is a conversation to have carefully rather than a claim to lean on.)
High ability as a concealer
There is a specific reason very bright people are easy to miss. High intelligence appears to let someone compensate for underlying executive-function difficulties for a long time, which can mask or delay the recognition of ADHD and raise the risk of a missed diagnosis. The best synthesis of this concludes that ADHD is a valid diagnosis even at high levels of intelligence (it looks and behaves like ADHD), while being honest that the evidence base is limited. A small study of treatment-naïve adults found that high IQ could indeed "mask" ADHD by compensating for executive deficits. This is worth holding with caution: at least one study found that high intelligence did not substantially change the cognitive profile of ADHD, so "high IQ hides it" is a reasonable working idea, not a settled law.
Concealed by the environment, not actively masked
The framing matters here, both for accuracy and for how it lands with the person. What I am describing is not active masking in the sense the autism literature uses, the effortful and often exhausting performance of looking fine. It is something quieter: symptoms that were concealed by the environment. A childhood with a good balance of structure, direction and challenge can do the compensating for a person, so the underlying difficulty never gets a chance to show. That is a passive, external mechanism, environmental scaffolding, and it fits what we know about compensation in able people with ADHD. An account of adults deliberately camouflaging ADHD traits does exist, but it is a recent and comparatively thin line of research, and I would not lean on it as if it were established. So I would describe these histories as concealed by circumstance, not as the person having hidden anything.
Writing it down honestly
A lot of my correspondence with colleagues comes down to the letter: how to describe a trajectory like this accurately without overstating what can be evidenced. The honest position is that we cannot know what this person's childhood performance would have looked like without the structure, because it was never tested; their circumstances never allowed it. What we can say is that they clearly thrived and showed their full ability under those conditions; that performance dropped markedly once conditions became more self-directed and less supported; and that the most parsimonious reading is that they were relying heavily on that external structure and would plausibly have struggled without it earlier, in the same way they struggled without it later. We cannot conclude they were impaired in childhood. Equally, we cannot conclude they were not, because the question was never put to the test.
I would frame any possible childhood difficulties as concealed by exceptionally supportive environments, rather than as active masking, and I would lean on the one genuinely strong piece of evidence these presentations tend to offer: a clear, specific picture of "under these conditions the person functions like this; under those conditions, like that." That conditional pattern is diagnostically valuable, though how much weight a given assessor gives it will vary. Where the letter is a summary of symptoms and history to support an onward assessment (a structured interview such as the DIVA walks through every criterion once for childhood and once for adulthood ), it does not need to settle the childhood question at all. It only needs to lay out the trajectory honestly and let the assessing service do its job.
One last thing, offered to colleagues rather than clients: this pattern is close to home for a lot of us who do this work, and recognising yourself in a client is a reason to be more careful, not less. It is worth sense-checking, ideally with a trusted colleague, whether the fit you are seeing is really in the material or partly in your own history. That caution is not a reason to dismiss the pattern, which is real and common, only to hold it honestly.
References
About the author. Dr Emma Bede is a Clinical Psychologist at Willow Psychology.
Guest article by Dr Emma Bede, Willow Psychology, published on drlouiselegg.com with permission. General information only; it is not a diagnosis, medical advice, or a substitute for an individual assessment. If low mood or hopelessness is part of the picture, please speak to your GP; in crisis, call Samaritans free on 116 123 at any time.