Summary: Bullying is often dismissed as a normal part of growing up, but recent research shows it can lead to clinically significant trauma in young children. A short-term longitudinal study of 250 elementary students in grades 3–5 found that more than 40% of children who experienced peer victimization reported trauma symptoms such as intrusive thoughts, avoidance, and heightened vigilance.
The study makes clear that physical aggression is only one form of harm. Relational aggression—being excluded, gossiped about, or targeted online—can produce lasting psychological effects. Early-onset cyberbullying means the harassment often follows children from school into the home, eroding safe spaces and increasing distress.
Key Facts
- High prevalence of trauma symptoms: About 43% of children who reported peer victimization experienced trauma symptoms at clinically meaningful levels.
- Relational and covert harm: Nonphysical forms of aggression—exclusion, rumors, property damage—produced trauma responses comparable to physical bullying.
- Cyberbullying starts early: Roughly one in four students in grades 3–5 reported being targeted online, showing that cyber victimization often begins in middle childhood.
- Teacher awareness gap: Teachers identified far fewer incidents than students reported, especially when behaviors occurred out of adult view or involved subtle social dynamics.
- Longer-term impact: Trauma-related symptoms persisted for more than six months, indicating sustained effects on children’s mental health.
Source: University of Florida
New research from the University of Florida indicates that peer victimization and bullying can cause trauma symptoms among elementary school children. The study, published in the Journal of Clinical Child & Adolescent Psychology, tracked 250 students over a school year to examine how different forms of victimization—traditional and cyber—affect trauma-related outcomes.
“Bullying is often viewed as a normal part of growing up, but our findings suggest that for many children these experiences can be genuinely harmful,” said John L. Cooley, Ph.D., lead author and assistant professor in UF’s College of Education. Researchers followed children in grades three through five at two elementary schools and collected both child- and teacher-reports to measure exposure to peer victimization and subsequent trauma symptoms.
Peer victimization included teasing, exclusion, threats, rumor-spreading, property destruction, and cyber victimization. Bullying was defined as repeated aggression that reflects a power imbalance. Researchers found that nearly nine in ten students experienced at least one incident of peer victimization early in the school year. Those children reported trauma symptoms across multiple domains: avoidance, intrusive thoughts, negative mood, heightened physical arousal, and altered self- or other-perceptions.
Children described trying to avoid reminders of the events, withdrawing from peers, experiencing unwanted memories, having trouble sleeping, and feeling continually on guard. These responses are consistent with trauma-related symptom patterns and persisted when assessed again 6.5 months later.
One notable finding was the early emergence of cyber victimization. About one in four children reported online targeting, often following conflicts that began at school and continued on gaming platforms or messaging apps. This pattern reduces children’s opportunities to recover from stressful interactions and increases the intensity and duration of harm.
The study also revealed a substantial awareness gap: teachers reported far fewer incidents than children. Many forms of relational aggression—gossip, exclusion, or property damage—occur outside adult supervision or are less visible, so they can go undetected unless adults proactively ask students about their experiences.
Researchers recommend routine screening and direct conversations between parents, educators, and children about peer experiences. Early identification of trauma symptoms can support timely interventions, and awareness of cyberbullying’s early onset highlights the need for prevention strategies that include online behavior and device use.
Frequently Asked Questions
A: Yes. The study showed that exclusion and gossip can trigger the same trauma responses as physical aggression. Children reported intrusive memories and avoidance behaviors—core markers of trauma-related reactions.
A: Many incidents happen out of adult sight or take the form of subtle social exclusion or rumor-spreading, which are harder to detect than overt physical fights. This leads to underreporting by staff compared with student reports.
A: The study found that about one in four children in grades 3–5 experienced cyber victimization. Conflicts that begin at school can continue online, reducing safe, device-free time for children to recover.
Editorial Notes
- This article was edited by a Neuroscience News editor.
- The journal paper was reviewed in full by editorial staff.
- Additional context was provided by the reporting team to clarify implications for children’s mental health and school practices.
About this research
Author: Eric Hamilton, University of Florida
Source: University of Florida
Contact: Eric Hamilton, University of Florida
Image credit: Neuroscience News
Original Research: “Peer Victimization and Bullying are Potentially Traumatic Stressors Among Children” by John L. Cooley and colleagues; published in the Journal of Clinical Child & Adolescent Psychology. DOI and full text available through the journal.
Abstract
Peer Victimization and Bullying are Potentially Traumatic Stressors Among Children
Objective
This study addressed gaps in the literature by examining peer victimization and cyber victimization during middle childhood—a period that has received relatively little longitudinal attention. The researchers aimed to identify exposure thresholds associated with increased risk for trauma symptoms and to track those symptoms over time.
Method
The sample included 250 children in grades 3–5 (52% boys; 50% Hispanic/Latinx) and their homeroom teachers. Researchers used child- and teacher-reports to measure peer victimization and child-reports to measure bullying. Trauma symptoms were assessed at two time points across the school year.
Results
Across time points, 43% of children who experienced peer victimization reported elevated trauma symptoms. Both traditional and cyber victimization, as well as bullying, were associated with increased trauma symptoms that persisted 6.5 months later. Reports of victimization occurring “2 or 3 times a month” represented meaningful lower-bound thresholds, while experiences “several times a week” posed the greatest risk.
Conclusions
A significant proportion of children exposed to peer victimization develop clinically meaningful trauma symptoms. Traditional and cyber victimization during middle childhood confer lasting risk. The findings highlight the need for screening to identify affected children and for research into trauma-focused interventions tailored to this age group.