ADHD , or attention deficit hyperactivity disorder, often persists untreated into adulthood. Although approximately 10 million people are estimated to have it in the U.S., only 1 in 10 have received treatment for it. Many adults with ADHD lead successful careers, but the condition can create job challenges. Impulsivity, hyperactivity and inattentiveness are hallmarks of ADHD, though symptoms vary. “Each person with ADHD is unique, and the symptoms of ADHD can differ from one person to the next,”