By Sarah Nauyokas ADHD, or attention-deficit/hyperactivity disorder, is one of the most common neurodevelopmental disorders in the United States. It is typically characterized by difficulty focusing, impulsivity, and, in some cases, hyperactivity. However, the condition can look very different from person to person. While ADHD affects both men and women, research has shown that women are frequently misdiagnosed, underdiagnosed, or not diagnosed until adulthood.  Cedars-Sinai