The Children's Mental Health Crisis Nobody Knows How to Fix

Rates of anxiety and depression in children and adolescents have doubled since 2010. Here is the evidence on what is causing this and the painful debate about smartphones versus other factors.

The documented deterioration of adolescent mental health — anxiety and depression rates approximately doubling since 2010 across multiple developed countries, with the trend accelerating after 2012 and again after 2020 — is the most discussed and least resolved public health trend affecting younger generations. The debate about its causes is genuinely contested among researchers in ways that the public discussion doesn't always reflect.

Jonathan Haidt's 'The Anxious Generation' thesis — that smartphone adoption, particularly social media use, is the primary driver of the adolescent mental health crisis — has attracted both significant support and significant methodological critique. The support: the timing correlation between smartphone proliferation (especially among adolescent girls, who are most severely affected) and mental health deterioration is specific enough to be compelling. The nature of social media's psychological mechanisms — social comparison, cyberbullying, sleep disruption from evening screen use, displacement of in-person social activity — are plausible and some are individually well-evidenced.

The critique: the international pattern of mental health deterioration is not uniformly correlated with smartphone use. Some Scandinavian countries with very high smartphone penetration show less severe mental health deterioration than the US and UK. Pre-smartphone mental health trends in some populations were already negative before 2012. And the specific effect sizes attributable to social media use in longitudinal studies, while real, are smaller than the scale of the mental health crisis appears to require as primary explanation.

Alternative and complementary explanatory factors: economic insecurity following the 2008 financial crisis, which created material and psychological stress for families whose children developed their adolescent identities in an atmosphere of financial precarity. Climate anxiety — documented as a significant source of psychological distress for adolescents who have come of age during escalating climate urgency. And the specific sleep disruption that precedes and predicts both mental health deterioration and social media use, raising the question of which is cause and which is symptom.

For the intervention implications: the smartphone restriction policies being implemented in schools (UK national policy, multiple US state policies) are addressing a real factor through a tractable intervention. They are unlikely to fully resolve a crisis whose causes appear to be multiple and mutually reinforcing.