How common is adult ADHD?
Quick answer: Globally, about 2% to 3% of adults meet ADHD criteria at any point in time. Rates vary by method and region. Many are diagnosed later when demands increase or recognition improves. Early recognition helps people access supports that improve daily functioning.
Prevalence estimates differ based on whether studies use symptom screens, full clinical interviews, impairment thresholds, or medical records. Systematic reviews suggest approximately 2 to 3% of adults meet criteria at any point in time.
Rates vary by sex, age band, and region. Recognition patterns and access to care also influence measured prevalence. Many adults are first identified later in life when demands rise or children are evaluated.