What is ADHD?

Understanding ADHD

Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental condition. This means it relates to how the brain develops and works, not to personality, upbringing or effort. It affects how people manage attention, activity levels and impulse control.

ADHD is not a new condition, though understanding of it has grown a lot over the years. It's now recognised as something that can affect children, teenagers and adults, and it often looks quite different from person to person.

The three main areas ADHD can affect

Most descriptions of ADHD group traits into three broad areas:

• Attention – difficulty sustaining focus on tasks that aren't especially interesting, being easily distracted, or losing track of what you were doing.
• Hyperactivity – feeling restless, fidgety, or having a lot of internal or physical energy that's hard to sit with.
• Impulsivity – acting or speaking before thinking things through, interrupting, or finding it hard to wait.

Not everyone with ADHD experiences all three in the same way. Some people are mostly inattentive, with little outward hyperactivity — this presentation is sometimes missed, especially in girls and women. Others show more hyperactive-impulsive traits, and many people have a mix of both.

A neurodiversity-affirming view

Many clinicians and researchers now describe ADHD as a difference in how the brain is wired, rather than purely a list of deficits. People with ADHD often bring creativity, energy, hyperfocus on things they love, and out-of-the-box thinking alongside the challenges. Framing ADHD this way doesn't dismiss real difficulties — it just recognises that ADHD brains aren't "broken," they work differently.

That said, ADHD traits can cause genuine day-to-day difficulty, particularly in environments that expect everyone to focus, sit still and plan in the same way. This is why a formal diagnosis and support can be genuinely useful for many people, even when they've developed coping strategies over the years.

What causes ADHD

The exact causes aren't fully understood, but research points to a strong genetic component, alongside differences in brain development and neurotransmitter activity (particularly dopamine and noradrenaline systems). ADHD is not caused by poor parenting, too much screen time, or diet alone, although environment can affect how noticeable traits are and how well someone copes.

How common is it

ADHD is considered one of the more common neurodevelopmental conditions, affecting people across all ages, backgrounds and genders. Awareness has increased substantially in recent years, particularly among adults who weren't identified as children — often because ADHD presentations in girls, quieter children, or high-achieving adults can be less obvious to teachers and clinicians using older diagnostic assumptions.

ADHD and other conditions

ADHD often overlaps with other conditions, including autism, anxiety, depression, dyslexia and dyspraxia. This is sometimes called co-occurrence. It's one of the reasons a proper assessment matters — traits can look similar across conditions, and untangling them helps in getting the right support.

Getting a diagnosis

A diagnosis is usually made following a structured assessment carried out by a qualified clinician, such as a psychiatrist or specialist nurse, following recognised guidance such as NICE guideline NG87 in the UK. This typically involves looking at developmental history, current functioning across different settings (home, school, work), and ruling out other explanations for the difficulties described.

Assessments can take place through the NHS, via NHS Right to Choose routes, or privately. Waiting times and costs vary widely depending on the route and provider, so it's worth asking any clinic or service directly for current information and a written fee schedule where relevant.

Living well with ADHD

There's no single "fix" for ADHD, but a combination of understanding, environmental adjustments, practical strategies, and sometimes medication can make a real difference to daily life. Many people find that once they understand their ADHD, they can work with their brain rather than against it — building routines, tools and support that fit how they actually think.

If you recognise some of these traits in yourself or someone you care for, it's worth speaking to a GP as a starting point. They can discuss next steps, including possible referral routes for a full assessment.

When to seek support

If ADHD traits are causing noticeable difficulty at school, work, or in relationships, or affecting confidence and wellbeing, it's worth reaching out for advice. A GP can help you understand local options, and organisations that specialise in ADHD can offer information while you consider next steps.