Attention deficit hyperactivity disorder (ADHD) is a group of behavioural symptoms that include inattentiveness, hyperactivity and impulsiveness.
ADHD can occur in people of any intellectual ability, although it is more common in people with learning difficulties. People with ADHD may also have additional problems, such as sleep and anxiety disorders.
Symptoms of ADHD tend to be first noticed at an early age, and may become more noticeable when a child’s circumstances change, such as when they start school. Most cases are diagnosed in children between the ages of 6 and 12.
The symptoms of ADHD usually improve with age, but many adults who are diagnosed with the condition at a young age will continue to experience problems.