ADHD Is Not Just a Childhood Condition
Attention deficit hyperactivity disorder (ADHD) is one of the most common neurodevelopmental conditions, affecting approximately 5% of children — and 2.5–4% of adults. For decades, ADHD was considered something children outgrow. The reality is that 50–65% of children with ADHD have clinically significant symptoms into adulthood. Moreover, many adults are diagnosed for the first time — particularly women, who are historically underdiagnosed because the inattentive presentation is less obvious than the disruptive hyperactivity more common in boys.
How Adult ADHD Looks Different
The classic image of a child bouncing off the walls rarely applies to adults. In adults, hyperactivity becomes internalised — it manifests as restlessness, an inability to relax, constantly feeling "driven by a motor," or inner tension rather than physical overactivity. The core presentation shifts:
- Chronic disorganisation — missed deadlines, forgotten appointments, lost items, chaotic living or working spaces
- Time blindness — difficulty estimating how long tasks take; chronic lateness; "time just disappears"
- Difficulty sustaining attention — starting tasks is easier than finishing them; reading requires rereading; mind wanders in conversations
- Hyperfocus — paradoxically, the ability to become intensely absorbed in highly interesting tasks (gaming, creative work, research) to the exclusion of everything else
- Emotional dysregulation — quick to frustration or anger; intense emotional reactions; rejection sensitive dysphoria (RSD) — extreme emotional pain in response to perceived criticism
- Executive function impairment — difficulty planning, prioritising, initiating tasks (especially boring ones), switching tasks
- Impulsivity — interrupting, making impulsive decisions (financial, relational), difficulty waiting
- Working memory deficits — forgetting what you were about to do; difficulty holding multiple pieces of information mentally
The Three Presentations
- Predominantly Inattentive — most common in women and adults; often missed because it lacks disruptive behaviour
- Predominantly Hyperactive-Impulsive — more typical in young boys; often the "classic" presentation
- Combined presentation — meets criteria for both; most common overall
Conditions That Commonly Co-occur
ADHD rarely travels alone. Comorbidities are the rule rather than the exception in adults:
- Anxiety disorders (50% of adults with ADHD)
- Depression (30–50%)
- Sleep disorders — particularly delayed sleep phase syndrome and insomnia
- Substance use disorders (ADHD is a major risk factor; untreated ADHD triples the risk)
- Autism spectrum disorder
- Learning disabilities (dyslexia, dyscalculia)
Diagnosis
ADHD diagnosis is clinical — there is no brain scan or blood test. DSM-5 requires at least 5 of 9 inattentive symptoms and/or 5 of 9 hyperactive-impulsive symptoms, present for ≥6 months, in at least two settings, causing functional impairment, with onset of symptoms before age 12 (not necessarily diagnosis).
Assessment typically involves:
- Structured clinical interview (adult ADHD diagnostic scales: DIVA-5, CAARS, ADHD-RS)
- Retrospective childhood history (school reports, parental accounts where available)
- Ruling out alternative diagnoses: anxiety, depression, bipolar disorder, thyroid dysfunction, sleep apnoea
- Neuropsychological testing may be used but is not required for diagnosis
Medication: The Most Evidence-Based Treatment
Stimulant medications are the most effective treatment for ADHD, with large effect sizes in network meta-analyses:
- Methylphenidate (Ritalin, Concerta, Medikinet) — first-line in most guidelines; immediate-release (3–4 hour duration) and extended-release formulations. Works by blocking reuptake of dopamine and norepinephrine.
- Amphetamines (Adderall, Vyvanse/lisdexamfetamine) — also first-line in many guidelines; slightly larger effect size in adults than methylphenidate in some analyses
- Atomoxetine (Strattera) — non-stimulant norepinephrine reuptake inhibitor; takes 4–6 weeks to work; preferred if stimulants are contraindicated (e.g. active psychosis, cardiovascular risk) or when anxiety is prominent
- Bupropion — off-label antidepressant with mild ADHD efficacy; useful when depression coexists
- Guanfacine / clonidine — alpha-2 agonists; help with emotional dysregulation and impulsivity; less effective for inattention
Common concerns about stimulants:
- Cardiovascular: modest increase in heart rate and BP; baseline ECG advised in those with cardiac risk factors; avoided in uncontrolled hypertension or structural heart disease
- Appetite suppression and weight loss — most pronounced early; consider taking with food, taking "medication holidays" on weekends (debated)
- Addiction risk is low when used as prescribed; conversely, treating ADHD with stimulants reduces long-term substance use disorder risk
Psychological Treatments
Cognitive-behavioural therapy adapted for ADHD (CBT-ADHD) helps with:
- Organisational skills and time management
- Managing procrastination
- Emotional regulation and coping with rejection sensitivity
- Addressing the secondary depression and low self-esteem that often accumulate from years of undiagnosed ADHD
CBT is typically recommended alongside medication rather than instead of it for adults with significant functional impairment.
Practical Strategies
- External structure compensates for impaired internal regulation: timers, alarms, visual reminders, body doubling (working alongside someone)
- Exercise — aerobic exercise acutely increases dopamine and norepinephrine; 30 minutes before a cognitively demanding task improves focus
- Consistent sleep schedule — sleep deprivation dramatically worsens ADHD symptoms
- Single-tasking environments — remove distractions rather than relying on willpower (phone in another room, website blockers)
- Task initiation strategies — "just two minutes," implementation intentions (if-then planning)