One in four US adults suspect they have undiagnosed ADHD, a new study finds, but only 13% have shared their concerns with a doctor. Attention-deficit/hyperactivity disorder is a developmental disorder characterized by inattentiveness,

Roughly 15.5 million U.S. adults have attention-deficit hyperactivity disorder, and most of them struggle with gaining access to treatment for the condition, according to data from a U.S. study released on Thursday.

While attention-deficit/hyperactivity disorder -- also known as ADHD -- is typically thought of as a childhood condition, a new study on Monday showed that one in four or 25 per cent of adults in America suspect they may have it but is undiagnosed.