Common symptoms of ADHD, or attention deficit hyperactivity disorder, in teenagers include increased irritability, hyperactivity, poor concentration and impulsive thoughts or actions, according to WebMD. Teenagers with ADHD are distractible and have difficulty concentrating or focusing on multiple tasks.
Teenagers with ADHD often face challenges in school because they struggle with distractions and the ability to concentrate or focus, as WebMD explains. ADHD patients are often forgetful or become bored with class work, causing them to become impatient, inattentive or excessively attentive. Teenagers with ADHD typically find it difficult to sit still for long periods of time without fidgeting and commonly squirm in seats or tap hands or feet. Excessive talking or constant interrupting are symptoms of ADHD as well.
Symptoms of ADHD commonly develop over several months, according to PsychCentral. Others often label teenagers as attention seekers, discipline issues or apathetic learners when ADHD remains undiagnosed or untreated. Teenagers with ADHD have difficulty organizing activities and tasks and often skip from one activity to the next without completion. As a result, grades in school settings do not accurately reflect the teenager's abilities because distractions, hyperactivity and a lack of organization impact abilities to complete work in a timely manner.