ADD/ADHD is a biological brain-based condition characterized by inattention, distractibility, hyperactivity and impulsivity. While the exact causes are unknown, it is thought to have genetic components. ADHD is diagnosed through evaluations of behaviors in multiple environments. Stimulant medications are commonly used to treat core symptoms, while behavioral therapies can help develop coping strategies. Effective treatment involves a combination of medication and psychosocial support tailored to individual needs.