"Doctors used to be taught that ADHD affects only children," explains Lenard Adler, M.D., director of the adult ADHD program at New York University. "But now we know that, although hyperactivity may wane, ADHD symptoms such as inattention and impulsivity continue into adulthood."
The condition is still widely underdiagnosed in the general population. Experts estimate that about 80 percent of adults with attention deficit — roughly 5 million — haven't been officially diagnosed and are going untreated. Most undiagnosed adults know that they have more difficulties than others with organization, focus, and productivity than peers or colleagues, so the diagnosis rarely comes as a complete surprise.