Adolescence is a challenging time for most young people, but for those with or at-risk of developing emotional or mental health conditions, it can be particularly harrowing. Studies indicate that 1 in 5 adolescents have some sort of serious emotional, behavioral, or mental health problem. Early identification and treatment can make a substantial difference in the lives of these troubled young people. Aware and knowledgeable teachers can play a critical role in this helping process. This article focuses on ways that classroom teachers can recognize warning signs for these problems and provide developmentally appropriate support to students who are struggling.