Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by executive dysfunction occasioning symptoms of inattention, hyperactivity, impulsivity and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and developmentally-inappropriate. ADHD symptoms arise from executive dysfunction, and emotional dysregulation is often considered a core symptom.
https://en.wikipedia.org/wiki/Attention_deficit_hyperactivity_disorder