ADHD is defined by a trio of symptoms (inattention, hyperactivity, and impulsivity). All of these symptoms are thought to arise from dysfunctional levels and regulation of dopamine and norepinephrine in the brain (specifically the prefrontal cortex).
ADD is primarily defined by inattention and impulsivity. Like ADHD these symptoms are thought to arise from dysfunctional levels and regulation of dopamine and norepinephrine in the brain (specifically the prefrontal cortex).
Inattentive symptoms or inability to sustain attention may manifest itself as impaired problem-solving or impaired memory, resulting in inefficient information processing.
Hyperactive and impulsive symptoms such as excessive talking or physical movement, interrupting conversations, acting without thinking, or fidgeting are very common in children and tend to decrease in adolescence and adulthood. Nevertheless, these symptoms remain a problem in some teenagers and adults.