Background: Psychosis is a common and functionally disruptive symptom of many psychiatric, neurodevelopmental, neurologic, and medical conditions and an important target of evaluation and treatment in neurologic and psychiatric practice. Objective: The purpose of this paper is to outline the importance of the evolution of depression, psychosis and mania among adolescents, and to provide a general perspective upon the impact of these disorders on the lives of these young patients and their families. This papers also aims to emphasize the fact that trauma can really affect one's emotional stability, and can be considered a trigger factor for different types of psychiatric conditions. Methods: We present the clinical case of a 17-year old female patient, hospitalized in emergency for psychomotor agitation, aggressive behavior, dromomania, autolytic ideation. Data on the clinical manifestation, trigger factors, treatment and evolution are discussed. Conclusions: When it comes to treating adolescents, whether it is depression, anxiety or other psychiatric disorders, treatment should be prescribed with caution, because the symptomatology is not very clearly defined. This polymorphism can offer a higher level of difficulty when it comes to establishing the right diagnosis.