A sweeping new study tracking more than 8,000 American preteens has found that addiction-like patterns of smartphone, social media, and video game use are associated with a troubling array of mental health problems, sleep disturbances, and even suicidal behaviors one year later. The research, published in the American Journal of Preventive Medicine, offers the strongest evidence yet that how young adolescents engage with screens—not merely how much time they spend on them—may shape their psychological development during a particularly vulnerable window of life.

The findings arrive as policymakers, parents, and health professionals grapple with an adolescent mental health crisis that has intensified over the past decade. Nearly half of all American adolescents have experienced some form of mental illness, and research consistently shows that mental health disorders often take root early, with one-third emerging by age 14 and half by age 18. The new study suggests that problematic digital habits forming in the preteen years may be one piece of this troubling puzzle.

“Problematic screen use is when kids can’t control their time online, even if they try, and it starts to cause stress, conflicts, or problems at school or home,” explained lead investigator Jason M. Nagata, a physician in the Division of Adolescent and Young Adult Medicine at the University of California, San Francisco. “It can also lead to withdrawal-like feelings, needing more time online to feel satisfied, and repeated relapses, much like other addictive behaviors.”

The research team drew on data from the Adolescent Brain Cognitive Development Study, the largest long-term investigation of brain development and child health ever conducted in the United States. They followed participants who were 11 to 12 years old at the study’s outset, assessing their patterns of mobile phone, social media, and video game use through validated questionnaires designed to capture addiction-like symptoms such as preoccupation, compulsion, loss of control, and interference with daily functioning.

One year later, the researchers examined a broad spectrum of outcomes, including symptoms of depression, anxiety, attention problems, oppositional and defiant behavior, conduct issues, sleep quality, suicidal thoughts and behaviors, and initiation of alcohol, tobacco, and marijuana use.

The results painted a concerning picture. Problematic mobile phone and social media use were prospectively linked to higher scores on measures of depressive symptoms, somatic complaints like headaches and body aches, attention deficits, oppositional defiant behavior, and conduct problems. Both forms of problematic use were also associated with increased odds of suicidal behaviors, sleep disturbances, and trying alcohol, tobacco, or marijuana for the first time.

Problematic video game use showed a somewhat narrower but still significant pattern, predicting higher depressive and attention-related symptoms, oppositional behavior, suicidal behaviors, and disrupted sleep. However, unlike phone and social media use, problematic gaming was not linked to substance initiation or somatic complaints in this age group.

The study’s prospective design—following the same children over time rather than simply capturing a snapshot—represents a significant methodological advance. Most previous research on adolescent screen use and mental health has been cross-sectional, making it difficult to determine whether problematic use precedes mental health struggles or vice versa. This longitudinal approach allows researchers to observe whether early problematic screen behaviors predict later difficulties, strengthening the case for a potential causal pathway.

The U.S. Surgeon General’s 2023 Advisory on Social Media and Youth Mental Health specifically called for more prospective studies, a greater focus on younger adolescents, and research distinguishing between overall screen time and problematic, addiction-like use. The new study directly addresses all three of these evidence gaps.

“Not all screen time is harmful,” Dr. Nagata emphasized. “The real risk comes when use becomes addictive or problematic, when kids can’t stop, feel stressed if they don’t use it, or it starts to disrupt sleep, mood, or daily life.”

This distinction matters because blanket warnings about screen time may miss the point. A teenager using their phone to video chat with a grandparent or complete homework assignments is engaging in fundamentally different behavior than one who cannot put down their device despite wanting to, who loses sleep scrolling through social feeds, or who experiences anxiety when separated from their phone. The research suggests that these compulsive patterns, rather than screen use itself, carry the greatest risks.

Several mechanisms may explain the observed associations. Fear of missing out—the anxiety that others are having rewarding experiences without you—has been shown in prior research to mediate the relationship between problematic social media use and depression. Constant notifications and the pressure to respond immediately may contribute to attention problems. Video games, meanwhile, may serve as a form of escapism that, when excessive, leads to social isolation and heightened depressive symptoms. Sleep disruption, a consistent finding across all three forms of problematic use, is both a symptom of mental health difficulties and a risk factor for their development.

One particularly striking finding concerned age verification for social media platforms. The vast majority of participants in the study were under 13 years old—below the minimum age set by most major social media companies for creating accounts. This suggests that existing age verification mechanisms are failing to keep preteens off platforms that may pose risks to their developing minds.

The researchers acknowledge important limitations. The study’s observational design cannot definitively prove causation, and the relatively short one-year follow-up may not capture longer-term effects. The sample, while large and diverse, included a high proportion of families with college-educated parents, potentially limiting generalizability. Effect sizes, while statistically significant and larger than those previously reported for screen time alone, were modest in absolute terms.

Still, the implications for clinical practice and public health are substantial. The American Academy of Pediatrics has long encouraged families to create media use plans, and this research underscores the wisdom of that approach—particularly for preteens on the cusp of dramatically expanding their digital lives. Clinicians who work with young adolescents may benefit from screening not just for screen time but for the addiction-like patterns that appear to carry greater risk.

“Our findings suggest that digital platforms and families alike should consider ways to reduce addictive features of apps and social media, since these patterns of use are modifiable and can affect adolescent mental health,” Dr. Nagata concluded.

As the first generation to grow up with smartphones in their pockets from childhood enters adolescence, understanding which aspects of digital life pose genuine risks—and which do not—has never been more urgent. This study brings us closer to answers, suggesting that the battle for young minds may hinge less on limiting screen time and more on preventing the compulsive, uncontrollable patterns that transform a useful tool into a psychological burden.

---

Endnotes

1. Nagata JM, Shim JE, Balasubramanian P, et al. Prospective Associations Between Early Adolescent Problematic Screen Use, Mental Health, Sleep, and Substance Use. American Journal of Preventive Medicine. 2026;000(000):108248.
2. Elsevier. Addictive digital habits in early adolescence linked to mental health struggles, study finds. EurekAlert! February 12, 2026.
3. Solmi M, Radua J, Olivola M, et al. Age at onset of mental disorders worldwide: large-scale meta-analysis of 192 epidemiological studies. Molecular Psychiatry. 2022;27(1):281-295.
4. U.S. Surgeon General. Social media and youth mental health: the U.S. Surgeon General’s Advisory. Washington, DC: U.S. Surgeon General; 2023.
5. Merikangas KR, He J, Burstein M, et al. Lifetime prevalence of mental disorders in U.S. adolescents: results from the national comorbidity survey replication—adolescent supplement (NCS-A). Journal of the American Academy of Child and Adolescent Psychiatry. 2010;49(10):980-989.