Attention Deficit Hyperactivity Disorder (ADHD) accounts for approximately 5% to 10% of mental disorders in childhood and adolescence. Symptoms, or some of them, persist into adulthood. In addition to the core symptoms, other manifestations of mental disorders are often present. These comorbidities increase impairment and complicate treatment, why physicians who treat patients with ADHD need to know a wide variety of comorbid circumstances and must differentiate between symptoms and associated disease. Therefore, the knowledge attention, thoughtfulness and treatment of ADHD and all its associated diseases is crucial to ensure the best possible prognosis. However, the relation is discussed, asking for clinical manifestations of the ADHD or comorbidities of this disorder.