 It is estimated that between 2 – 5 % of adults have ADHD . Around 25 @-@ 50 % of children with ADHD continue to experience ADHD symptoms into adulthood , while the rest experiences fewer or no symptoms . Most adults remain untreated . Many have a disorganized life and use non @-@ prescribed drugs or alcohol as a coping mechanism . Other problems may include relationship and job difficulties , and an increased risk of criminal activities . Associated mental health problems include : depression , anxiety disorder , and learning disabilities . 
