Objective: To evaluate the prevalence of depression, its causes and effects in adolescentsassisted at Caps da Cidade Ocidental, based on the 190 analyzed medical records. Material and methods: This is an analytical study based on the reports and records examined. Results: With the completion of this research, it appears that depression is a serious disease that requires attention and monitoring by properly prepared professionals, it is also observed that the greatest incidence of this pathology is in female patients, it appears that around 70% of these patients still do not receive adequate treatment. Conclusion: External - the early evaluation of these patients is extremely important, in view of the recurrent increase of this pathology in adolescents, but I emphasize that the longer the diagnosis is made, the greater the chances of a correct and effective treatment.