Attention-Deficit/Hyperactivity Disorder (ADHD)
Attention-Deficit/Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder involving a persistent pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or development. It is not simply carelessness, boredom, or lack of discipline. Symptoms must be inconsistent with the person's developmental level, occur in more than one setting, and cause meaningful difficulty.
DSM-5-TR uses three presentation names: predominantly inattentive presentation, predominantly hyperactive/impulsive presentation, and combined presentation. Presentation can change with age; an adult may not leave their seat frequently but may experience inner restlessness, poor organisation, and impulsive decisions. Diagnosis is clinical and is not confirmed by brain imaging, EEG, or online testing.
What Is Attention-Deficit/Hyperactivity Disorder (ADHD)?
Inattention in ADHD involves difficulty sustaining attention, organizing and completing tasks, or attending to details; it does not mean an inability to focus on every activity. Hyperactivity and impulsivity may include motor restlessness, excessive talking, difficulty waiting, and acting without considering consequences. Intense focus on a highly engaging activity does not rule out ADHD. The central difficulty is regulating attention and behaviour in accordance with situational demands.
Possible Symptoms in Daily Life
Symptoms fall into two areas and not all need to be present:
- Frequent inattention errors, difficulty staying on task or following a conversation without missing important information.
- Difficulty organizing time and materials, delayed task initiation, an accumulation of unfinished tasks, and frequent loss of belongings.
- Avoidance of tasks that require sustained mental effort, and easy distraction by external stimuli or unrelated thoughts.
- Motor restlessness, leaving one's seat when remaining seated is expected, running or climbing in children, and a sense of inner restlessness in adults.
- Excessive talking, answering before the question is finished, difficulty taking turns, and interrupting or intruding on others' activities.
- Inconsistent performance, forgotten obligations, relationship difficulties, impulsive buying or driving, and exhaustion from constantly trying to compensate.
How It Is Diagnosed
Assessment is conducted by a suitably trained professional and includes developmental, educational, occupational, and medical history. It uses clinical interviews, rating scales, and information from multiple sources; it is not based on a questionnaire alone.
- For children up to age 16, at least 6 symptoms of inattention and/or at least 6 symptoms of hyperactivity-impulsivity are required. For people age 17 or older, at least 5 symptoms are required in the relevant domain.
- Symptoms persist for at least 6 months, are inconsistent with the person's developmental level, and negatively affect social, academic, or occupational activities.
- Several symptoms were present before age 12, and several are present in two or more settings, such as home, school, work, or social situations.
- There is clear evidence that the symptoms interfere with or reduce the quality of social, academic, or occupational functioning. They do not occur exclusively during a psychotic disorder and are not better explained by another mental disorder.
How It Can Affect Life
At school, ADHD may appear as forgotten materials, slow task completion, or disruptive classroom behaviour. At work, it can contribute to missed deadlines, difficulty prioritizing, and overload. In relationships, forgetfulness or interruption may be misinterpreted as indifference. Many people develop elaborate compensatory systems that work at substantial internal cost. Assessment also identifies strengths and avoids attributing every difficulty to ADHD.
Causes and Risk Factors
ADHD has a multifactorial origin with a strong genetic component, but no single gene diagnoses or determines it. Perinatal and environmental factors have been associated with increased risk, but associations do not prove simple causation for an individual. Upbringing, sugar or screens are not thought to be sole causes, although sleep, stress and environmental demands can affect the intensity of symptoms. Differences seen in group imaging studies are not used as an individual diagnostic test.
What Else Can Look Similar or Co-occur
Many conditions affect attention and behaviour, so a comprehensive assessment is needed:
- Sleep deprivation, apnea, irregular hours, medications, substances, a thyroid or other medical condition can reduce attention.
- Anxiety, depression, trauma, and bipolar disorder have different time courses and additional symptoms, but they can co-occur.
- Autism, language disorder and intellectual disability affect behaviour and demands differently and do not necessarily exclude ADHD.
- Specific Learning Disorder causes persistent difficulty in reading, writing or doing math. A child may be distracted because the task is too difficult or have both diagnoses.
- Oppositional behaviour may occur when requests are forgotten or not completed, but Oppositional Defiant Disorder has its own pattern of anger and defiance.
Treatment and Support
The plan is based on age, severity, preferences and co-occurring needs:
- Individual and family information, shared goals, and environmental adaptations such as a visible schedule, brief instructions, reduced distractions, and structured breaks.
- Work with the school or workplace to arrange reasonable accommodations and use written reminders, timers, tasks divided into manageable steps, and designated places for belongings.
- Parent training when needed for positive structure and consistent strategies; recommendation does not mean caregivers caused ADHD.
- Pharmacological treatment with stimulant or non-stimulant drugs may be recommended by a specialist when symptoms cause persistent significant difficulty, with health screening and regular monitoring of efficacy and side effects.
- For adolescents and adults, structured supportive psychological intervention, often with elements of cognitive-behavioural therapy, can work on organisation, emotion, impulsivity, and self-esteem.
When to Seek an Assessment
Get help when attention or impulsivity difficulties persist, occur in multiple settings, and affect learning, work, relationships, or safety. An assessment is also useful when the effort is much greater than it appears on the surface or when anxiety, depression, tics, sleep or learning difficulties co-occur. Sudden new inattention, confusion, or a significant personality change needs medical evaluation and should not automatically be considered ADHD.
Frequently Asked Questions
Do inattention and hyperactivity both need to be present?
No. DSM-5-TR recognizes predominantly inattentive presentation, predominantly hyperactive/impulsive presentation, and combined presentation. Presentation may change over time.
Can brain imaging confirm ADHD?
No. Imaging differences are research findings in groups and do not have sufficient precision for individual diagnosis. The evaluation remains clinical and based on multiple informants.
Can it co-occur with Specific Learning Disorder?
Yes. ADHD affects regulation of attention and action, while learning disability affects specific school skills. Accurate differential diagnosis leads to different but complementary accommodations and interventions.