What part of the brain is affected by ADHD?

ADHD affects the whole brain. Brain development in young people with ADHD is up to three years slower, says the National Institute of Mental Health. This delay is particularly marked in the cerebral cortex, which includes the parts of the brain responsible for planning, thought, attention and voluntary action.

People who suffer with attention deficit hyperactivity disorder often find it hard to pay attention, are overly active and sometimes display impulsive behavior. ADHD is a disorder that sometimes continues from childhood to adulthood. It is usually treated through a tailored combination of education, psychotherapy, medication, diet and exercise. As of 2014 what causes ADHD remains unknown, says the National Institute of Mental Health.