ADHD is a neurodevelopmental disorder with symptoms that include inattentiveness, hyperactivity and impulsivity. It is typically diagnosed in children ages 6 through 12, but attention-deficit hyperactivity disorder symptoms can continue into adulthood.
Although it is widespread, the cause of the disorder is still relatively unknown. Available evidence suggests that ADHD is genetic. Many parents of children with ADHD experienced symptoms when they were younger, and it is commonly found in siblings within the same family. Low levels of dopamine (a brain chemical), which is a neurotransmitter, are found in children with ADHD, along with a lower metabolism in the areas of the brain that control attention, social judgment, and movement.