It's estimated a total of 2.6million people in the UK have attention deficit hyperactivity disorder but many haven't received a formal diagnosis.
ADHD is a condition that affects people's behaviour. People with ADHD can seem restless, may have trouble concentrating and may act on impulse.
Most cases are diagnosed when children are under 12 years old, but sometimes it's diagnosed later in childhood. Sometimes ADHD is not recognised when someone was a child, and they are diagnosed later as an adult.
