This restrospective study is to determine the rate of psychiatric pathologies of adolescents who come for examination and treatment at the Department of Adolescent Health - National Children's Hospital from January 2020 to April 2021. We use the ICD-10 International Classification of Diseases for diagnosis. The mental illnesses accounted for 27.9% of the adolescents who came for examination and treatment. Among psychiatric pathologies, three groups with the highest rates are behavioural and emotional disorders with onset usually occurring in childhood and adolescence (chapter F9) with 45.9%, neurotic, stress-related and somatoform disorders (chapter F4) (29.4%) and mood [affective] disorders (chapter F3) (8.1%). Among the psychiatric pathologies, mood disorder; anxiety and behaviour disorder are the highest prevalent. We recommend to provide training to human resources in psychiatric specialties to effectively treat these conditions.