Teen Depression Assessment View Calculator Early symptoms of adolescent depression can be difficult to diagnose because they appear to be so normal for teenagers. Teenage depression isn't just bad moods and occasional melancholy. Depression limits a teenager's ability to function normally. Depression symptoms in teenagers may include a persistent sad mood, irritability, feelings of hopelessness, or the inability to be happy for a period of weeks, months, or even years. Take this quick assessment to learn more about the symptoms of teenage depression and help you determine whether or not your teen might suffer from depression. Learn more about putting this calculator or other calculators on your website.