Jun 12, · Adult attention deficit hyperactivity disorder (ADHD or ADD) is a neurological disorder that affects an estimated percent of U.S. adults, and is more commonly diagnosed in men (%) than in women (%) 1. Many people have heard of ADHD. It may make you think of kids who have trouble paying attention or who are hyperactive or impulsive. Adults can have ADHD, too. About 4% to 5% of U.S. adults have it.