Understanding ADHD: Symptoms, Types, and Diagnosis

What is ADHD?

Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental conditions affecting children and often continuing into adulthood. It is characterized by persistent patterns of inattention, hyperactivity, and impulsivity that interfere with daily functioning and development. While many people occasionally experience focus issues or restlessness, individuals with ADHD experience these challenges to a degree that significantly impacts their academic performance, professional progression, relationships, and self-esteem.

ADHD is frequently first identified during primary school, as the demands of the classroom environment highlight difficulties with concentration or remaining seated. While boys are diagnosed more frequently than girls, research suggests this is often due to differences in presentation. Boys tend to display more externalised symptoms like physical hyperactivity, whereas girls often present with quieter, inattentive signs such as daydreaming, forgetfulness, and disorganization.

The Three Subtypes of ADHD

ADHD is not a one-size-fits-all condition. Depending on how symptoms present, it is classified into three primary presentations:

• Predominantly Inattentive Presentation: Individuals with this subtype struggle primarily with focus, organization, and staying on task. They may make careless mistakes, have difficulty following detailed instructions, easily lose essential items like keys or schoolwork, and find themselves frequently distracted by unrelated thoughts.
• Predominantly Hyperactive-Impulsive Presentation: This subtype is marked by excessive physical movement and hasty actions taken without forethought. Symptoms include constant fidgeting, an inability to remain seated, excessive talking, interrupting conversations, and difficulty waiting for one's turn.
• Combined Presentation: This is diagnosed when an individual meets the criteria for both inattention and hyperactivity-impulsivity consistently over time.

How is ADHD Diagnosed?

There is no single test to diagnose ADHD. Instead, a comprehensive evaluation from a qualified healthcare professional or mental health expert is essential. To receive a diagnosis, symptoms must be persistent, present for at least six months, and noticeable in more than one setting—such as both at home and at school or work. While the condition can be identified at any stage of life, including adulthood, symptoms must have been present before the age of twelve.

A professional evaluation typically involves gathered observations from caregivers, teachers, and the individual, alongside standardized questionnaires. The specialist will also take a detailed medical, educational, and developmental history. This thorough approach is crucial, as many other conditions—such as learning differences, anxiety, mood disorders, or thyroid issues—can mimic or coexist with ADHD. An accurate assessment ensures that individuals receive the precise, tailored support they need to thrive.