What have longitudinal studies shown about ADHD symptoms into adulthood?

Longitudinal studies on ADHD (Attention-Deficit/Hyperactivity Disorder) symptoms have shown that many individuals experience a reduction in symptoms as they transition into adulthood. While some may still exhibit certain traits of ADHD, such as difficulties with focus or organization, a significant number of people find that the more overt hyperactive and impulsive behaviors diminish over time. This decline can be attributed to various factors, including maturation, increased coping strategies, and behavioral adaptations developed through life experiences.

This contrasts with other potential patterns like an increase in symptoms, which is not typically supported by longitudinal data, as well as the notions of symptoms remaining constant or becoming more severe; these do not align with the majority of findings in research. Thus, the evidence suggests that many individuals with ADHD may not experience the same level of challenges into adulthood as they did during childhood or adolescence.