Attention deficit hyperactivity disorder (adhd) [1] is a neurodevelopmental disorder characterised by symptoms of inattention, hyperactivity, impulsivity, and emotional dysregulation that are excessive.. Adhd is a developmental disorder characterized by an ongoing pattern of one or more of the following types of symptoms:
Attention deficit hyperactivity disorder (adhd), usually first diagnosed in childhood, can appear in a variety of forms and has many possible causes.. You can have adhd in three different types depending on whether the symptoms are more about trouble with attention,.