Teenagers who are physically abused by their parents are not only more likely to battle feelings of sadness, hopelessness, and poor mental health — they are also less likely to get even the minimum amount of sleep their developing brains require, and more likely to use substances and to attempt suicide. That is the sobering conclusion of a new study drawing on survey responses from nearly 14,000 American adolescents, which found that self-reported parental physical abuse flagged elevated risk across every outcome the researchers examined, from mood and sleep duration to suicidal thoughts and actions. Published in the Journal of Child and Family Studies, the research arrives amid growing scientific alarm that violence inside the family home does not stay contained within it, but radiates outward into nearly every system of a young person’s body and mind.

The study was led by Ishita Kapur of Idaho State University, working with Reeve Kennedy of East Carolina University and Holly Thurston of The Ohio State University. The team analyzed data from the 2023 National Youth Risk Behavior Surveillance System, or YRBSS, the large school-based survey administered by the U.S. Centers for Disease Control and Prevention that periodically takes the pulse of American adolescents on everything from dietary habits to experiences of violence. Their analytic sample comprised 13,917 young people between the ages of 12 and 18. Because the YRBSS is administered anonymously in classroom settings, adolescents may be more willing to disclose painful experiences than they would be in a face-to-face interview — a methodological point that carries real weight, since decades of survey research have shown that the mode and format of sensitive questions can dramatically alter how honestly people answer.

Parental physical abuse is, by any measure, a global public health concern. The CDC classifies child abuse and neglect as encompassing physical, emotional, and sexual harm as well as failures of care, and notes that in the most tragic cases maltreatment is fatal; systematic reviews of child homicide around the world highlight how often the perpetrators are the very people responsible for a child’s care. Yet even short of such catastrophic outcomes, the consequences of abuse are profound and far-reaching. Previous research has linked childhood maltreatment to heightened disease vulnerability across the lifespan, to lasting impairments in social cognition, and to sharply elevated rates of psychiatric illness. What has been less clear is how one specific form of maltreatment — physical violence perpetrated by parents — maps onto the day-to-day mental states and health behaviors of adolescents in the middle of their schooling and social lives. The new study was designed to address precisely that gap.

Methodologically, the researchers began with a self-reported measure of parental physical abuse and then examined how it related to four clusters of outcomes: mental health and mood, sleep, substance use, and suicidal behaviors. The mental health indicators included whether adolescents had felt sad or hopeless and whether they rated their mental health as poor. The sleep measure captured whether participants slept at least eight hours per night, the minimum recommended for adolescents by leading sleep and pediatric organizations. Substance use items covered behaviors such as alcohol and drug use, while the suicidality measures spanned the spectrum from thoughts and plans to actual attempts. Using regression models that estimate odds ratios — a standard statistical technique that quantifies how the odds of a given outcome change in one group relative to another — the team found that reporting parental physical abuse was associated with increased odds across all outcome variables examined, a consistency that is itself statistically telling.

The mental health findings, while perhaps the least surprising, were among the clearest. Adolescents who reported parental physical abuse were significantly more likely to say they had felt sad or hopeless, and more likely to describe their mental health in negative terms. The result dovetails with decades of accumulated evidence: systematic reviews and meta-analyses have linked all major forms of child maltreatment to elevated rates of depressive and anxiety disorders, and neurobiological research suggests that early abuse leaves measurable traces in the developing brain, reshaping stress circuitry in ways that increase vulnerability to mood disorders across the lifespan. One influential line of work argues that abuse and neglect are associated not only with more psychiatric illness but with poorer response to treatment when illness does strike — a double burden that makes prevention and early identification all the more urgent. The new findings add contemporary, national-scale evidence that the association holds for parental physical abuse specifically, measured in the very population still living through it.

Then there is sleep — the finding that gives the study much of its breadth. Adolescents exposed to parental physical abuse showed reduced odds of sleeping more than eight hours per night, the minimum recommended for their age group. The biology here is anything but trivial. Adolescence is marked by a natural circadian phase delay: the internal clock governing the timing of melatonin release shifts later, pushing teens’ preferred sleep window toward the small hours even as early school start times force early waking. Layer chronic stress and threat on top of that maturational shift, and the result can be a brain locked in a state of hyperarousal. The hypothalamic-pituitary-adrenal axis — the body’s central stress system, which floods the bloodstream with cortisol in response to perceived danger — is thought to become dysregulated under conditions of chronic maltreatment, and elevated nighttime cortisol is a well-documented enemy of falling and staying asleep. Systematic reviews have consistently found that children and adolescents with maltreatment histories suffer more insomnia, nightmares, and behavioral sleep disturbances, and that sleep problems in adulthood can trace back to abuse experienced decades earlier. Sleep, in other words, may be one of the quiet conduits through which childhood adversity is translated into lifelong disease.

The substance use findings fit the same pattern. Adolescents reporting parental physical abuse had increased odds of substance use, a result that echoes a large literature connecting adverse childhood experiences to substance use disorders. Researchers have proposed several mechanisms, including the self-medication hypothesis — the idea that some young people turn to alcohol or drugs to blunt emotional pain, anxiety, or insomnia — as well as broader models in which early adversity dysregulates the brain’s developing reward circuitry. The adolescent prefrontal cortex, the seat of impulse control and long-range planning, remains under construction well into the mid-twenties, while reward-related subcortical systems mature earlier, creating a window of particular vulnerability. Early substance initiation during this window is associated with worse academic trajectories and a higher likelihood of dependence in adulthood, which is why the authors frame adolescent substance use not as ordinary teenage recklessness but as a potential signal of underlying trauma.

The most alarming results concern suicidality. Reporting parental physical abuse was associated with increased odds of suicidal thoughts and actions, including suicide attempts — a finding that lands with particular force at a time when suicide remains a leading cause of death among young people. The result reinforces older clinical research linking adolescent physical abuse to suicidal behavior, as well as more recent studies showing that family physical violence sharply elevates risk among especially vulnerable groups, including gender-minority adolescents. Proposed mechanisms include the corrosive effects of abuse on self-esteem, the normalization of violence within family relationships, and the profound hopelessness that can take root when the people charged with protecting a child are the source of harm. Earlier studies have identified family support and self-esteem as protective factors that buffer suicide risk among at-risk adolescents — a point that underscores how precisely this study’s risk factor sits at the heart of what might otherwise shield a young person.

Taken together, the authors argue, the results make a compelling case for trauma-informed and whole health approaches to identifying and treating youth exposed to parental physical abuse. In practice, trauma-informed care means that clinicians, teachers, and pediatricians operate from the assumption that difficult behaviors may be adaptations to trauma rather than signs of defiance or pathology, and that the therapeutic relationship itself must avoid re-traumatization. Evidence-based interventions exist: trauma-focused cognitive behavioral therapy, which helps young people process traumatic memories and restructure maladaptive beliefs about themselves and the world, has accumulated strong support in systematic reviews and meta-analyses. And because sleep, mood, and substance use so often travel together, the researchers suggest that care should address the whole person rather than isolated symptoms — screening for sleep problems when a teenager presents with depression, for instance, or gently exploring safety at home when a teenager presents with escalating substance use. Pediatricians, school nurses, and school-based mental health professionals are often the first adults positioned to notice the constellation of signs.

The study is not without limitations, and the authors are careful about what their data can and cannot show. Because the YRBSS is cross-sectional — a snapshot taken at a single point in time — it cannot establish that parental physical abuse causes poor sleep or suicidal behavior; unmeasured family-level factors could conceivably contribute to both. The abuse measure is self-reported, and although anonymous surveys tend to elicit more honest answers about stigmatized experiences than interviews do, disclosure remains subject to fear, shame, and imperfect recall, and the data cannot capture the severity, frequency, or chronicity of the violence. Still, the sheer consistency of the signal — elevated odds across every outcome examined, in a sample of nearly 14,000 adolescents drawn from across the United States — is difficult to dismiss. As the authors conclude, the findings point to the need to focus on trauma-informed and whole health approaches not only to treat young people who have experienced parental physical abuse, but to identify them, because the harms of violence at home do not stay at home. They follow teenagers into their bedrooms, their bloodstreams, and their thoughts — and, with the right kind of attention from the adults around them, they may be interrupted before they calcify into lifelong struggles.