Inattentive adhd used to be called attention deficit disorder. Children who have it have a lot of difficulty paying attention. Thats how you can tell it apart from two other types of the disorder. Webmd explains adhd in teens, including its symptoms and treatment and offers advice on how parents can help adolescents learn to manage. attention deficit hyperactivity disorder (adhd) is a neurodevelopmental disorder most common in children and adolescents. A child or teen must meet 6 or more of the above symptoms for at least 6 months to qualify for this component of the adhd diagnosis. Symptoms of adhd present differently in girls as they are often more subtle and harder to identify. While boys are more likely to show signs of hyperactivity and impulsivity at a young age, inattentive adhd in teen girls is often overlooked as it also tends to be associated with emotional issues rather than behavioral problems. inattentive adhd (often called add) manifests as forgetfulness, disengagement, or distractibility, and can be mistaken for anxiety or a mood disorder in adults. Teen adhd, or attention deficithyperactivity disorder, is a disorder that causes inattentive or hyperactive and impulsive behavior in teens inappropriate to their age. Adhd can be difficult to gauge in the teenage years because teenagers mature at different rates and may naturally be inattentive or impulsive at times. adhd teens tend to be more impulsive drivers and have more accidents due to risky behaviors. Research has also shown that adhd teens have more difficulty making and keeping well-adjusted friends. attention deficit hyperactivity disorder (adhd) can affect boys and girls differently.