Among the neurobehavioral disorders that children and adolescents most frequently seek treatment for is ADHD. ADHD frequently has long-lasting effects that persist into adulthood, including noticeable symptoms. Co-occurring disorders such as disruptive, mood, anxiety, and substance abuse are frequently linked to ADHD. Reviewing symptoms and impairments helps establish the clinical diagnosis of ADHD. Data from neuropsychology, neurochemistry, neuroimaging, and genetics all support the disorder's biological basis