According to the diagnostic manual for mental disorders, (DSM-5; APA, ), the main features of ADHD are the same for children and adults. Signs and Symptoms of Adult ADHD - ADHD: Attention Deficit Hyperactivity Disorder. May 26, · About 4 percent of adults have attention deficit hyperactivity disorder (ADHD), and many others have never been diagnosed. (About half of kids with ADHD still have it in adulthood.) A diagnosis can be important.
Dec 29, · Signs and Symptoms Inattention and hyperactivity/impulsivity are the key behaviors of ADHD. Some people with ADHD only have problems with one of the behaviors, while others have both inattention and hyperactivity-impulsivity. Most children have the combined type of ADHD.