Attention Deficit Hyperactivity Disorder
Attention Deficit Hyperactivity Disorder (ADHD) was a disorder characterised by compulsively unfocused behavior.
Gavin Oliver Scott was a "habitually dreamy" child. Professor Milligan postulated he had attention deficit disorder but this was disputed by Kent-Green. (PROSE:The Least Important Man)
Panda said the Hither were an entire culture suffering from ADHD. (PROSE: Lieut. Gullivar Jones: His Bad Weekend)
Reliable remedies were available for ADHD by 2036. (PROSE: Artificial Intelligence)
Donna Noble didn't give the Tenth Doctor coffee because he was "last person [she would] give caffeine". She told Silvi to search ADHD and joked that the Doctor's picture would come up. (AUDIO: Technophobia)
Clara Oswald told the Twelfth Doctor he had "Attention Deficit something or other". (TV: The Doctor's Meditation)