Optimism is a central concept in the field of positive psychology that focuses on the expectations that people have about the results of their future events. This review presents a synthesis of evidence from primary studies, whose findings reflect the role of optimism in adolescent mental health. This systematic review used a narrative approach for the data, based on the parameters of the Cochrane method and PRISMA. A protocol was registered in PROSPERO (Register number: CRD42019142616). A total of 31 articles, in a cohort of 46,262 adolescents between 13 and 17 years, showed significant primary outcomes which evidenced the role of optimism as a predictor, mediator, and protector of mental health during adolescence. This evidence suggests that optimism contributes significantly to the mental health of adolescents, functioning as a predictor of good mental health, a buffer against the impact of stress, and a protector against pathological symptoms and risk behaviors.

乐观是积极心理学领域的一个核心概念，它关注人们对未来事件结果的期望。本综述综合了来自初级研究的证据，其结果反映了乐观在青少年心理健康中的作用。这小号基于 Cochrane 方法和 PRISMA 的参数，系统评价对数据使用了叙述方法。协议已在 PROSPERO 中注册（注册号：CRD42019142616）。在 46,262 名 13 至 17 岁青少年的队列中，共有 31 篇文章显示了显着的主要结果，证明了乐观作为青春期心理健康的预测因素、中介因素和保护因素的作用。这一证据表明，乐观对青少年的心理健康有显着贡献，可作为良好心理健康的预测指标、对压力影响的缓冲以及对病理症状和危险行为的保护。