Mary is a 10 year-old girl who is having very difficulty following directions given by her teachers. In a recent parent-teacher conference, her teacher told her mother that Mary is not paying attention to details, having difficulty sustaining her attention in tasks and losing her books and pencils in a few days. At home, she is easily distracted, forgetful and having difficulty waiting for her turn. Her mother asked you whether this is attention deficit hyperactivity disorder. Which of the following is true regarding this disease?
