New Study Reveals Alarming Rate of Teen Mental Health Decline Amid Pandemic. A disturbing new study has shed light on the devastating impact of the COVID-19 pandemic on the mental health of teenagers. Researchers found that the rate of teen mental health decline accelerated significantly during the pandemic, with alarming increases in anxiety, depression, and suicidal thoughts among adolescents. The study's findings have sparked concerns among experts and parents, who are calling for increased support and resources to address the growing mental health crisis affecting young people.