ADHD is believed to persist into adulthood to some extent in roughly 46-66% of cases.

Often, ADHD is not recognized or diagnosed until the person is an adult. Symptoms may not be as clear as they are in children. In adults, hyperactivity may decrease, but struggles with impulsiveness, restlessness and difficulty paying attention may continue.

Treatment for adult ADHD is similar to treatment for childhood ADHD. Adult ADHD treatment includes medications, psychological counseling (psychotherapy) and treatment for any mental health conditions that occur along with ADHD.