It isn’t a teary topic fit only for moody young adult fiction and sudsy afternoon TV dramas: Depression afflicts as many as a third of girls, becoming a rising problem for some as early as age 11 and increasingly separating out as gender difference in the mental health between boys and girls.
The higher incidence of depression in girls—found in interview research with more than 100,000 young participants from 2009 to 2014 in the annual, statistically representative National Survey of Drug Use and Health—has raised concern among mental health experts. They note that depression can cause patients to struggle with relationships and school. It can lead some to suicide and may require sustained treatment for those with more serious cases.
Researchers could not explain why girls are more affected by depression, and they were surprised to find the earlier gender divergence, with it occurring at younger ages than had been tracked before. This tends to undercut existing psychological theories, they said, that depression in girls may be triggered by hormone changes or other significant life shifts that occur in their teens.