Why American Teens Are So Sad

The United States is experiencing an extreme teenage mental-health crisis. From 2009 to 2021, the share of American high-school students who say they feel “persistent feelings of sadness or hopelessness” rose from 26 percent to 44 percent, according to a new CDC study. This is the highest level of teenage sadness ever recorded.

The government survey of almost 8,000 high-school students, which was conducted in the first six months of 2021, found a great deal of variation in mental health among different groups. More than one in four girls reported that they...