ADHD (attention deficit hyperactivity disorder)

What is ADHD?

Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental condition that affects how the brain manages attention, impulse control and activity. It is usually identified in childhood, but many people — particularly women and those with mainly inattentive symptoms — are not diagnosed until adulthood.

ADHD is a recognised medical condition, not a character flaw or the result of poor discipline.

Symptoms

ADHD symptoms fall into two main groups, though many people have features of both:

Inattention:

• difficulty sustaining focus on tasks — especially boring or repetitive ones
• easily distracted by external stimuli or own thoughts
• forgetfulness in daily activities — keys, appointments, instructions
• difficulty organising tasks and managing time
• avoiding activities that need prolonged mental effort
• losing things frequently

Hyperactivity and impulsivity:

• fidgeting, restlessness, difficulty sitting still
• excessive talking or interrupting
• acting without thinking through consequences
• difficulty waiting in queues or taking turns
• feeling driven by an internal motor

In adults, hyperactivity often becomes an inner restlessness rather than obvious running and climbing. Inattention — disorganisation, procrastination, forgetfulness — may be the main problem.

How ADHD is diagnosed

Diagnosis requires specialist assessment. A GP cannot diagnose ADHD but can refer you to an NHS ADHD service (for adults) or community paediatrics or CAMHS (for children).

Assessment typically includes:

• detailed history of symptoms from childhood
• questionnaires — sometimes completed by parents, teachers or partners
• ruling out other conditions that can mimic ADHD — anxiety, depression, sleep problems, thyroid disorders, autism

Symptoms must be present in more than one setting (for example home and school/work) and cause significant impairment in daily life.

NHS waiting times for adult ADHD assessment vary widely by area and can be long. Some people choose private assessment — a GP may still accept a valid private diagnosis for ongoing care.

Treatment and support

There is no cure, but effective support exists:

For children:

• classroom adjustments and SEN support
• parent training programmes
• behavioural strategies
• medication (methylphenidate and others) when appropriate — prescribed by specialists

For adults:

• psychoeducation — understanding how ADHD affects you
• CBT adapted for ADHD
• coaching for organisation, time management and routines
• medication where appropriate
• workplace adjustments under the Equality Act 2010

Treatment is tailored to the individual. Not everyone needs medication, and medication alone is rarely the whole answer.

ADHD and mental health

People with ADHD have higher rates of anxiety, depression, and sleep problems. These can overlap with ADHD symptoms or result from years of struggling undiagnosed. A comprehensive assessment considers the full picture.

Common misconceptions

• “ADHD is just naughty children” — ADHD is a neurological difference with measurable effects on daily functioning.
• “Everyone is a bit ADHD nowadays” — occasional forgetfulness is normal; ADHD involves persistent, impairing symptoms since childhood.
• “Sugar and screens cause ADHD” — research does not support sugar as a cause. Excessive screen time may worsen attention but does not cause ADHD.
• “You grow out of it” — many adults continue to need support, though hyperactivity often becomes less visible.

When to see a GP

See a GP if you or your child have persistent attention, organisation or impulsivity problems affecting education, work or relationships. Bring examples — report cards, workplace feedback, or a partner’s observations — to help the conversation.

If you are waiting for assessment, practical strategies (timers, lists, reducing distractions, breaking tasks into steps) can help while you wait.

Getting help while waiting

NHS waiting lists for ADHD assessment can be lengthy. ADHD UK, the NHS website, and reputable books on adult ADHD offer evidence-based self-help strategies. Be cautious of unregulated online “diagnosis” services — a thorough clinical assessment matters for safe treatment decisions.

Common questions

What are the main symptoms of ADHD?

Inattention — difficulty focusing, forgetfulness, losing things, avoiding tasks needing sustained effort. Hyperactivity — fidgeting, unable to sit still, excessive talking. Impulsivity — interrupting, acting without thinking, difficulty waiting turns. Adults may mainly show inattention rather than obvious hyperactivity.

Can adults have ADHD if they were not diagnosed as children?

Yes. Many adults were not diagnosed in childhood, especially women and people with mainly inattentive symptoms. ADHD does not start in adulthood — a specialist looks for evidence of symptoms before age 12, though diagnosis can happen much later.

How is ADHD diagnosed?

There is no single blood test or scan. Diagnosis involves a detailed history — often questionnaires from the person, parents or teachers — and assessment by a specialist (psychiatrist, paediatrician or ADHD clinic). Symptoms must significantly affect daily life and not be better explained by another condition.

How is ADHD treated?

Treatment is individual and may combine psychoeducation, classroom or workplace adjustments, cognitive behavioural therapy (CBT), coaching for organisation, and medication (stimulants or non-stimulants) where appropriate. Treatment plans differ for children and adults.

Is ADHD overdiagnosed?

Views differ. Some people wait years for assessment while others question whether normal childhood behaviour is being medicalised. If you are concerned, a thorough specialist assessment is the appropriate route — not self-diagnosis from online checklists alone.

Sources

• NHS — Attention deficit hyperactivity disorder (ADHD)
• NICE — ADHD guideline