The present invention relates to a method and composition for diagnosing adolescent depression using IL-17, and the present invention can diagnose adolescent depression by measuring the presence or amount of IL-17 protein in a human biological sample. Through this, it has a useful effect of enabling appropriate medical measures to be made to patients in need of adolescent depression treatment, and can also be usefully used as a biomarker for the analysis of causes and pathologies of adolescent depression, and development of a treatment for depression.
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