Is ADHD overdiagnosed, underdiagnosed, or both?

Clinically, the answer is both, and that’s not a contradiction. ADHD is underdiagnosed in groups whose symptoms don’t match older stereotypes. Women, people with inattentive presentations, high academic achievers, adults, and people who learned to mask or overcompensate are frequently missed for years. Their symptoms are often misattributed to anxiety, depression, stress, or personality. By the time ADHD is recognized, impairment is usually significant. At the same time, overdiagnosis can happen in specific contexts. This is more likely when assessments are rushed, based only on questionnaires, or when normal stress, sleep deprivation, trauma, or situational overload is mistaken for ADHD without confirming lifelong patterns and cross setting impairment. The key issue is assessment quality, not prevalence. ADHD exists on a spectrum of attention and regulation, but diagnosis requires persistence, functional impact, and developmental history. When those criteria are applied carefully, many people who need support still go undiagnosed, while a smaller group may be incorrectly labeled. So ADHD can look overdiagnosed in places with low diagnostic rigor and underdiagnosed in populations that don’t fit narrow expectations. Both realities can coexist. The clinical goal is not fewer diagnoses or more diagnoses. It is accurate diagnoses that lead to meaningful support rather than dismissal or overpathologizing.