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Adult ADHD Symptoms

Young man being assessed by psychiatrist

ADHD is a neurodevelopmental disorder and learning difficulty that starts in childhood and can often persist into adulthood.


It is categorised into 2 types of behavioural problems: inattentive (attention deficit), and hyperactivity and impulsivity. Most people with ADHD have problems in both these categories (combined type) but this is not always the case, e.g. Inattentive type or Attention Deficit Disorder (ADD).

Symptoms in Adults

Adult ADHD affects 3-4% of the adult population. However, it remains unknown and undiagnosed in the majority of sufferers. In adults, the symptoms are more difficult to define, largely due to a lack of research into Adult ADHD. Since ADHD is a neurodevelopmental disorder, it cannot suddenly develop in adults without having been present in childhood. 

By the age of 25, an estimated 15% of people diagnosed with ADHD as children still have a full range of symptoms, and 65% still have some symptoms that affect their daily lives.

Symptoms associated with Adult ADHD:

Carelessness and lack of attention to detail

Continually starting new tasks before finishing old ones

Poor organisational skills

Inability to focus or prioritise

Continually losing or misplacing things


Restlessness and edginess

Difficulty keeping quiet, and speaking out of turn

Blurting out responses and often interrupting others

Mood swings, irritability, and a quick temper

Inability to deal with stress

Extreme impatience

Taking risks in activities, often with little or no regard for personal safety or the safety of others – for example, driving dangerously.


Contact our team today for free Adult ADHD testing and a private ADHD assessment.

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