Teenage depression isn’t just bad moods and occasional melancholy. Depression is a serious problem that impacts every aspect of a teen’s life. Left untreated, teen depression can lead to problems at home and school, drug abuse, self-loathing—even irreversible tragedy such as homicidal violence or suicide. Fortunately, teenage depression can be treated, and as a concerned parent, teacher, or friend, there are many things you can do to help.