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Understanding Attention Deficit Hyperactivity Disorder (ADHD)

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Understanding Attention Deficit Hyperactivity Disorder (ADHD)

Dr. Rao Khurram Ayoub

Medically reviewed by Dr. Rao Khurram Ayoub, RPh, PhD (Pharmaceutics)

Written by Dr. Muhammad Imran, M.Phil, PharmD, BSc

Updated on

Table of Contents

Attention Deficit Hyperactivity Disorder (ADHD) is not a simple behavioural quirk or a lack of self-discipline; it is a complex, lifelong neurodevelopmental condition that fundamentally shapes how a person processes the world around them.

What is Attention Deficit Hyperactivity Disorder (ADHD)?

ADHD is a neurodevelopmental condition that affects attention, impulse control, and activity levels. It has three recognised presentations.It has three recognised presentations:

  • Inattentive ADHD – forgetfulness, disorganisation, difficulty sustaining focus.

  • Hyperactive‑impulsive ADHD – restlessness, excessive talking, impulsive decisions.

  • Combined ADHD – features of both.

The Neurobiology and Causes of ADHD

ADHD is linked to executive dysfunction in the frontostriatal circuits. These brain pathways regulate attention, planning, and inhibition.

  • Neuroimaging shows reduced prefrontal cortex activity.

  • Dopamine and noradrenaline imbalances play a central role.

  • A study by Carrington et al., 2025 stated that disrupted synchronisation across executive and emotional networks contributes to ADHD symptoms.

  • Inattentive ADHD – forgetfulness, disorganisation, difficulty sustaining focus.

  • Hyperactive‑impulsive ADHD – restlessness, excessive talking, impulsive decisions.

  • Combined ADHD – features of both.

Symptoms and Clinical Presentation Across the Lifespan

ADHD Symptoms in Children and Adolescents

Children may show:

  • Fidgeting and restlessness

  • Difficulty following instructions

  • Careless mistakes in schoolwork

  • Impulsive behaviour

How Adult ADHD Manifests Differently

Adults often present with:

  • Poor time management

  • Forgetfulness and disorganisation

  • Emotional dysregulation

  • Difficulty sustaining attention at work

Symptoms evolve, meaning hyperactive traits in childhood may shift to inattentive features in adulthood.

How is ADHD Diagnosed? (DSM‑5 and NICE Guidelines)

Diagnosis requires:

  • DSM‑5 criteria: ≥6 symptoms in children, ≥5 in adults, lasting ≥6 months, across ≥2 settings.

  • NICE NG87: structured interview, collateral history, and exclusion of other causes.

Evidence‑Based Treatment and Clinical Management

Pharmacological Interventions (Stimulants vs. Non‑Stimulants)

  • Stimulants (methylphenidate, amphetamines) are first‑line, effective in most cases.

  • Non‑stimulants (atomoxetine, guanfacine, bupropion) are alternatives when stimulants are unsuitable.

Non‑Pharmacological Strategies (CBT and Lifestyle Adjustments)

    • CBT improves organisation, coping skills, and emotional regulation.

    • Lifestyle adjustments: sleep hygiene, structured routines, reduced caffeine, and mindfulness.

Frequently Asked Questions (FAQ)

Is ADHD only a childhood disorder?

No, it often persists into adulthood.

Yes, CBT and lifestyle changes can help.

Evidence is mixed, but balanced nutrition supports overall wellbeing

Global prevalence is ~5%, and diagnostic criteria ensure accuracy.

Refrences