A recent study found evidence of overdiagnosis and overtreatment of ADHD in children and adolescents. Investigators from the University of Sydney School of Public Health led by Luise Kazda, MPH, found long-term effects in diagnosing and treating ADHD in young patients with only mild symptoms. The overdiagnosis of ADHD may negatively affect those with less severe cases of the disease, as the harm outweighs the benefits of treatment.