Signs of ADHD in Adults and Children | Mindtalk

ADHD (Attention Deficit Hyperactivity Disorder) is one of the most common neurodevelopmental conditions affecting children and adults — but it is also one of the most frequently misunderstood. Not every restless child has ADHD. And not every adult who struggles with focus is fine. Recognising the specific signs, and understanding when they cross a clinical threshold, matters. If you are concerned about ADHD symptoms in yourself or your child, a Mindtalk psychiatrist can provide a comprehensive evaluation.

What Is ADHD? The Three Presentations

ADHD is a neurodevelopmental condition characterised by persistent difficulties in attention regulation, impulse control, and — in some presentations — hyperactivity. The DSM-5 recognises three presentations:

Predominantly inattentive presentation — significant difficulties sustaining attention, following through on tasks, organising activities, and managing working memory. Little or no hyperactivity. This presentation is most common in girls and is most frequently missed or misattributed to laziness, apathy, or anxiety.

Predominantly hyperactive-impulsive presentation — significant restlessness, difficulty remaining seated in situations where it is expected, excessive talking, interrupting others, and acting before thinking. Inattention is not the primary feature. More common in younger children.

Combined presentation — significant symptoms in both domains. The most commonly diagnosed type in school-age children.

Understanding which presentation a person has matters because treatment strategies — including which type of therapy and whether and how medication might help — differ between presentations. See the Mindtalk guide on hyperactive vs. inattentive ADHD for a detailed comparison.

Signs of ADHD in Children

Inattentive Signs in Children

• Frequently fails to give close attention to details or makes careless errors in schoolwork
• Has difficulty sustaining attention during tasks, play activities, or lessons
• Does not seem to listen when spoken to directly (even without obvious distraction)
• Does not follow through on instructions and fails to finish schoolwork or chores
• Has significant difficulty organising tasks and activities — messy work, poor time management, difficulty prioritising
• Avoids or strongly dislikes tasks requiring sustained mental effort (homework, reading assignments)
• Frequently loses things necessary for tasks (pencils, books, glasses, phone)
• Is easily distracted by unrelated thoughts or external stimuli
• Frequently forgets daily activities

These symptoms must be present across at least two settings — home and school — and must represent a significant departure from what is developmentally expected for the child's age. One poor report card or one bad week is not ADHD.

Hyperactive-Impulsive Signs in Children

• Fidgets with hands or feet, squirms in seat
• Leaves seat in classroom when expected to remain seated
• Runs about or climbs excessively in inappropriate situations
• Unable to play or engage in leisure activities quietly
• Often "on the go" or acts as if "driven by a motor"
• Talks excessively
• Blurts out answers before questions have been completed
• Has difficulty waiting their turn
• Interrupts or intrudes on others

Signs of ADHD in Adults

Adult ADHD is childhood ADHD that was not identified. In adulthood, when the external structure provided by school timetables and parental routines is removed, and executive demands increase, the underlying pattern becomes clinically apparent.

Adult ADHD presentations differ from childhood presentations. Hyperactivity often becomes internal — a feeling of mental restlessness, difficulty relaxing, an inability to "switch off" — rather than the visible physical activity seen in children. Inattention remains the most prominent and functionally impairing feature in adults.

Signs of ADHD in adults include: difficulty sustaining attention in work tasks, meetings, or conversations; difficulty initiating or completing projects; poor time management and chronic lateness; impulsive spending, decision-making, or communication; emotional dysregulation and low frustration tolerance; difficulty maintaining organised workspaces or managing administrative tasks; relationship difficulties due to forgetting commitments, interrupting, or appearing not to listen.

If you recognise a long-standing pattern of these difficulties — present since childhood even if not previously labelled — rather than a recent change in functioning, ADHD assessment is worth discussing with a psychiatrist.

What ADHD Is Not: Common Misconceptions

Not all distraction is ADHD. Difficulty concentrating when anxious, sleep-deprived, stressed, or in an understimulating environment is normal. ADHD requires the pattern to be pervasive, persistent, and present across multiple settings.

Not everyone with ADHD is hyperactive. The inattentive presentation — which is more common in girls and adults — presents without significant hyperactivity. These individuals are frequently not identified until they encounter demands that overwhelm their compensatory strategies.

Hyperfocus is not incompatible with ADHD. The ADHD brain can sustain intense focus on intrinsically interesting or stimulating tasks for extended periods. The deficit is in voluntary attention regulation — being able to choose where to focus and sustain it regardless of interest level — not in the capacity for focus per se.

Academic success does not rule out ADHD. Many high-intelligence individuals with ADHD perform adequately or well academically until demands exceed their compensatory strategies. Late diagnosis in university or early career is common for this reason.

When to Seek Assessment

The DSM-5 requires for a diagnosis: six or more inattentive symptoms OR six or more hyperactive-impulsive symptoms (five or more in adults over 17); symptoms present in at least two settings; onset before age 12; clear evidence of functional impairment; and symptoms not better explained by another condition (anxiety, depression, learning disability).

If these criteria fit — and particularly if the pattern has been present since childhood — a formal assessment with a psychiatrist or clinical psychologist is the appropriate next step. CBT for ADHD and, where indicated, medication can make a substantial difference to daily functioning and quality of life.