Not every concentration problem in an adult is ADHD. And a stimulant prescribed on the wrong diagnosis can accelerate bipolar conditions, mask depression or make anxiety chronic. What a careful psychiatric evaluation looks to rule out first.
In recent years, adult ADHD has become one of the most sought-after diagnoses in psychiatry offices — and, at the same time, one of the most poorly investigated. The complaint is almost always the same: difficulty concentrating, frequent forgetfulness, the feeling of always running late, a mind that won’t switch off, procrastination that has already cost a promotion and a relationship. The hasty conclusion is the same too: “it must be ADHD.” The prescription follows almost automatically: methylphenidate or lisdexamfetamine, at increasing doses until one “feels the effect.”
The problem is that a significant share of these cases is not ADHD. It is something else — and a stimulant prescribed on the wrong diagnosis is not neutral. It can accelerate a subclinical bipolar disorder, mask a depression, make anxiety chronic, or create an impression of improvement in the first few weeks and make everything worse within six months. The patient leaves the office relieved to have “a name,” and the doctor becomes convinced the problem is solved — while the real condition carries on underneath, untreated.
This text does not claim that adult ADHD doesn’t exist or that stimulants don’t work. Both statements would be absurd. The goal is a different one: to show why clinical investigation before medicating is decisive, and what a careful psychiatric evaluation seeks to rule out before settling on the diagnosis.
Why the “adult ADHD” label became a magnet
There are three reasons behind the explosion of diagnoses. The first is legitimate: the condition exists, it was historically underdiagnosed, and people who spent decades blaming themselves for a specific neurobiological way of functioning are finally finding a name and a treatment. The second is cultural: the continuous attention demanded by remote work, notifications and simultaneous cognitive demands has made some degree of difficulty focusing visible — in almost everyone. The third is commercial: telemedicine, online symptom checklists and a class of medications with a fast, noticeable effect create a funnel that pushes the diagnosis as the answer.
The result is a scenario in which the complaint “I can’t concentrate” reaches the psychiatrist already translated by the patient as “ADHD.” And the implicit pressure — from the patient, from the system, sometimes from the doctor themselves — is to confirm quickly and prescribe. That is where real investigation gets left behind.
What needs to be ruled out before saying it is ADHD
A well-trained psychiatrist knows that difficulty with attention is a symptom, not a diagnosis. And that there are at least five different conditions that present with this very same symptom at the office door. Each one of them completely changes the course of action.
1. Atypical depression or chronic dysthymia
Mild or moderate depressive conditions that drag on for years tend to wipe out concentration, working memory and motivation — exactly the picture a patient describes as “ADHD.” The clinical difference lies in the affective background: there is a persistent sense of emptiness, disproportionate fatigue, a subtle loss of pleasure, low-grade negative rumination. The patient often doesn’t recognize this as sadness — because it isn’t dramatic sadness, it is background apathy. Prescribing a stimulant in this picture brings partial relief in the first few weeks (any catecholamine lifts mood in the short term), but it doesn’t treat the depression. Within six months, the patient is worse — dependent on the stimulus, with mood even flatter during the periods off medication.
2. Bipolar II disorder
This is the most dangerous of the differential diagnoses. Bipolar II presents with clear depressive episodes and hypomanic episodes that the patient describes as “good phases” — high productivity, less sleep, creativity, energy. Because the hypomania goes unnoticed (the patient reports it as “when I was doing well”), the complaint brought to the office is the depression, or worse — the difficulty concentrating between episodes. Prescribing a stimulant in this picture is pouring gasoline on a controlled fire. A switch into full-blown hypomania or even mania is a predictable complication, and mood instability can become chronic in a way it would not have without exposure to the stimulant.
3. Long-standing generalized anxiety
The hypervigilance of chronic anxiety consumes cognitive resources that, phenomenologically, look exactly like an attention deficit. The patient can’t focus because they are spending attention monitoring for threat, going over the previous day’s conversations, anticipating scenarios. A stimulant in this picture amplifies the anxiety — the patient becomes more alert, more focused, and more distressed. It is common for them to describe the effect as “I can work, but I have a tightness in my chest all day.” The way out is to treat the anxiety, not to boost the alertness.
4. Untreated obstructive sleep apnea
This is the most frequently overlooked diagnosis. A middle-aged adult with weight gain, snoring, unrefreshing sleep and difficulty concentrating often receives methylphenidate when what they need is polysomnography and CPAP. Sleep fragmented throughout the night impairs memory consolidation and sustained attention the next day. No stimulant fixes that. And by postponing the sleep workup, the patient remains exposed to the increased cardiovascular risk that apnea carries. The clinical rule is simple: in any adult complaint about concentration, sleep must be investigated before any prescription.
5. The cognitive consequence of chronic psychological suffering
The last — and perhaps the most clinically delicate — is the case in which the difficulty with attention is a consequence, not a cause, of an overloaded psychic life. Draining relationships, grief that has not been worked through, chronic conflicts at work, unaddressed trauma — all of this silently consumes attentional resources. The patient needs psychotherapy to work through what is being kept under the table, not a stimulant so they can keep working despite the suffering. Prescribing medication here is a functional anesthesia that postpones a necessary encounter.
What a good evaluation does differently
A psychiatric interview that takes the diagnosis seriously spends time on three fronts: developmental history (the attention pattern must have been present since childhood to characterize classic ADHD), assessment of mood and anxiety over the past two to five years, and investigation of sleep as an independent pillar. Standardized instruments help — the ASRS scale for screening, the MDQ to detect hypomanic episodes the patient doesn’t recognize, specific questionnaires for sleep and anxiety. But no instrument replaces clinical listening: how the symptom is organized in the person’s life, what precedes it, what follows it, what it covers up.
A good psychiatrist also knows that ADHD rarely appears on its own. It commonly coexists with anxiety, with mild depression, with obsessive traits. A dual diagnosis changes the treatment plan — because treating only one of the vectors and ignoring the other is a recipe for failure.
When the stimulant is the right answer
This text is not anti-stimulant. When ADHD is the correct diagnosis, methylphenidate or lisdexamfetamine transform lives — they allow a person to access cognitive capacities they always had and were never able to sustain. The difference between that outcome and the bad outcome described above comes down to one thing: whether the diagnosis was made with the care it deserves, or simply rubber-stamped.
A patient who receives a stimulant on the right diagnosis reports something specific: a feeling of “being myself again,” not of “being better than everyone else.” There is no euphoria, no acceleration, no sense of being a turbocharged version of oneself. There is only the quieting of a background noise that was always there. That is the clinical marker that the diagnosis was well made — and it is what a good psychiatric evaluation looks for before writing the prescription.
What to do if you suspect ADHD
If you recognize yourself in this picture, the first step is not to see a psychiatrist asking for the medication. It is to see a psychiatrist asking for an investigation. The difference is big. The evaluation will take two or three appointments, will probably include polysomnography if there is any suspicion of apnea, will apply standardized mood and anxiety instruments, and will reconstruct with you the history of your attentional functioning since childhood. Only at the end of that process should the diagnosis be settled — whether to confirm ADHD or to name something else that had been showing up in that disguise.
This is the opposite of the fast track that has become popular. But it is the only one that treats what actually exists instead of accelerating what should never have been accelerated.
Related reading
- Generalized anxiety: when worry stopped protecting and started getting in the way
- Shorter attention span: when it isn’t just the phone
- When keeping everything in order becomes suffering: perfectionism, anxiety, and the exhaustion of never quite getting there
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Dr. Leonardo Sodré is a psychiatrist and psychotherapist in Brasília, Brazil (CRM-DF 14.206 · RQE 14.761). He holds a PhD in Psychiatry from UFRGS and teaches at the University of Brasília School of Medicine. This content is informational and educational, and does not replace individual clinical evaluation, diagnosis, or treatment.