Why Do Kids Bully? 7 Science-Backed Causes (2026)

By Alex Kumar · December 25, 2025

Why This Question Can’t Wait: The Hidden Urgency Behind 'Why Do Kids Bully Other Kids'

Every time a parent hears, "My child was called names on the bus," or sees their kindergartner withdraw after school, the question surfaces with visceral weight: why do kids bully other kids? It’s not idle curiosity—it’s a plea for clarity amid fear, guilt, and helplessness. And today, that urgency is sharper than ever: CDC data shows nearly 1 in 5 U.S. students report being bullied at school, while cyberbullying incidents among 10–13-year-olds have surged 62% since 2020. But here’s what most well-meaning adults miss: bullying isn’t a moral failing—it’s a developmental signal. When we mislabel it as ‘meanness’ or ‘phase,’ we delay the precise, empathetic interventions children—both the target *and* the one acting out—desperately need.

The 4 Core Drivers Behind Bullying Behavior (Not Just Personality Flaws)

Bullying is rarely random. Decades of longitudinal research—from the Yale Center for Emotional Intelligence to the American Academy of Pediatrics’ 2023 Clinical Report on Aggression—reveal four interlocking drivers. Understanding these transforms how we respond.

1. Unregulated Emotion & Underdeveloped Executive Function

Children who bully often lack the neural scaffolding to manage frustration, shame, or perceived threat. Brain imaging studies show delayed maturation in the prefrontal cortex—the region governing impulse control, empathy, and consequence prediction—especially in kids with ADHD, anxiety, or early trauma exposure. As Dr. Lisa Damour, clinical psychologist and author of Under Pressure, explains: “A 9-year-old who shoves a peer after losing a game isn’t ‘choosing’ cruelty—they’re experiencing an amygdala hijack with no built-in brake.” This isn’t excuse-making; it’s neurological reality. Intervention starts with co-regulation: teaching breathing techniques *before* conflict arises, using visual emotion charts (“How big is your worry?”), and embedding ‘pause points’ in daily routines—like a 30-second ‘reset corner’ before group work.

2. Social Learning & Power Imbalance Replication

Kids don’t invent bullying in a vacuum. They mirror patterns they observe: a sibling who dominates play, a coach who publicly criticizes, or even subtle adult behaviors—like interrupting others or mocking accents. A landmark 2022 University of Michigan study tracked 1,200 families over 5 years and found children exposed to coercive parenting (yelling, threats, inconsistent discipline) were 3.8x more likely to engage in relational aggression (exclusion, rumor-spreading) by age 11. Crucially, this isn’t about ‘bad parents’—it’s about unrecognized habits. One powerful shift? Replace ‘What did you do wrong?’ with ‘What were you trying to make happen?’ This flips focus from blame to intention—and opens space for skill-building.

3. Identity Exploration Through Dominance

Between ages 8–13, children undergo intense identity formation. For some, asserting control becomes a misguided strategy to answer: ‘Who am I in this group?’ Bullying can function as social currency—gaining status, deflecting insecurity, or cementing alliances. Consider Maya, a 10-year-old observed in a Rutgers School Climate Study: she mocked peers’ lunchboxes not out of malice, but because her own family’s financial stress made her terrified of being seen as ‘different.’ Her behavior wasn’t cruelty—it was a distorted attempt at self-protection. Solutions here require reframing: instead of punishment, offer *alternative pathways to belonging*: leadership roles (‘You’re great at organizing—want to help plan our class garden?’), mentorship opportunities, or structured peer collaboration where status comes from contribution, not comparison.

4. Neurodiversity & Misinterpreted Social Cues

Children with autism, language processing disorders, or sensory sensitivities may bully without intending harm. A child with auditory processing challenges might shout to be heard, misread facial expressions as hostile, or invade personal space seeking regulation—behaviors peers label ‘aggressive.’ According to Dr. Tony Attwood, clinical psychologist specializing in ASD, “Many so-called ‘bullying incidents’ are actually failed attempts at connection or sensory self-management.” Schools often mislabel this as defiance. The fix? Co-create accommodations: a ‘sensory break card’ for overwhelmed moments, explicit social scripts (“If someone looks upset, try: ‘Are you okay?’”), and peer education that normalizes differences—not just tolerance.

What Actually Works: Evidence-Based Strategies That Go Beyond ‘Telling a Teacher’

Traditional anti-bullying programs fail when they rely solely on reporting or zero-tolerance policies. A 2023 meta-analysis in JAMA Pediatrics reviewed 63 interventions and found only three approaches reduced bullying sustainably: restorative practices, social-emotional learning (SEL) integration, and parent-coach partnerships. Here’s how to apply them:

Restorative circles—not detention: Gather involved students (with trained facilitators) to explore impact: “When you said X, how did it land for you? For them? What repair feels right?” This builds accountability *and* empathy. A pilot in Portland Public Schools saw 71% fewer repeat incidents after 6 months.
SEL woven into academics: Teach perspective-taking during literature units (“How would the villain feel if he had support?”), use math word problems involving fairness, or embed emotion vocabulary in science labs (“What does ‘frustration’ feel like in your body during this experiment?”).
Parent-coach partnerships: Instead of ‘your child bullied mine,’ try: “We’re noticing patterns in both kids’ interactions. Could we co-create a plan supporting their social skills?” Frame it as shared problem-solving—not accusation.

When Bullying Signals Something Deeper: Red Flags & Next Steps

Occasional conflict is normal. Chronic bullying—especially with these markers—warrants professional support:

Target exhibits sleep disruption, somatic symptoms (stomachaches, headaches), or sudden academic decline
Bully shows no remorse, escalates despite consequences, or targets multiple peers across settings
Both children share risk factors: family instability, screen overuse (>4 hrs/day non-educational), or limited adult connection

Consult a child psychologist *before* crisis hits. The American Academy of Child & Adolescent Psychiatry recommends evaluation if bullying persists >2 weeks with functional impairment. Early intervention isn’t ‘overreacting’—it’s preventing entrenched patterns.

Root Cause	Telltale Signs	Immediate Parent Action	Long-Term Support Strategy
Emotional Dysregulation	Meltdowns over minor setbacks; physical aggression when frustrated; difficulty naming feelings	Teach ‘name-it-to-tame-it’: Use emotion cards daily; practice calm-down breathing together (not just during crises)	Enroll in evidence-based SEL program (e.g., RULER, Second Step); consult occupational therapist for sensory regulation tools
Social Modeling	Repeats phrases heard at home (“You’re stupid!”); mimics dominant behavior in groups; seeks approval through put-downs	Conduct a ‘language audit’: Record family conversations for 1 day; replace criticism with curiosity (“What made that hard?”)	Family therapy focused on attachment; model vulnerability (“I felt embarrassed when I spilled coffee—I took a breath and cleaned it up”)
Identity/Status Seeking	Targets peers who are different (appearance, ability, background); seeks audience for ‘jokes’; brags about power over others	Assign ‘pro-social leadership’ tasks: “You’re great at noticing details—could you help design our classroom kindness board?”	Join inclusive extracurriculars (e.g., robotics team, theater tech crew) where status comes from skill, not hierarchy
Neurodiverse Miscommunication	Interrupts constantly; stands too close; misses sarcasm; appears ‘rude’ without intent; fixates on rules	Create a ‘social script cheat sheet’: Visual prompts for greetings, joining play, asking for help	IEP/504 accommodation for social communication goals; peer buddy system with explicit training for both students

Frequently Asked Questions

Is bullying just a phase kids grow out of?

No—and this myth is dangerously pervasive. Longitudinal research from Duke University tracking 1,400 children found that 30% of elementary school bullies showed persistent antisocial behavior into adulthood, with higher rates of criminal conviction and relationship instability. Early bullying isn’t ‘normal’—it’s a red flag for unmet needs requiring skilled support. The good news? With timely, compassionate intervention, neural plasticity allows for profound rewiring of social pathways.

Should I confront the other parent directly?

Generally, no—unless you have an established, trusting relationship. Most experts (including the National Education Association) advise starting with school staff: counselors, principals, or designated bullying coordinators. They’re trained in de-escalation, confidentiality, and systemic solutions. If you do speak with the other parent, lead with shared concern—not blame: “I’ve noticed our kids seem stressed around each other. How can we support them both?”

My child says ‘they started it’—how do I respond without excusing bullying?

Acknowledge the feeling first: “It makes sense you’d feel angry if someone pushed you.” Then separate intent from impact: “Even if they acted first, hurting others isn’t how we solve problems. What could you do next time that keeps everyone safe *and* honors your feelings?” This validates emotion while upholding boundaries—a cornerstone of authoritative parenting.

Does screen time cause bullying?

Not directly—but it amplifies risk. Heavy social media use (especially image-focused platforms) correlates with increased social comparison, reduced face-to-face practice, and disinhibition online. The AAP recommends co-viewing content, discussing digital citizenship weekly (“What makes a comment kind or unkind?”), and using parental controls that prioritize *time limits* over surveillance. Focus less on ‘what they’re doing’ and more on ‘how it makes them feel.’

Can therapy help the child who bullies?

Yes—when it’s the right kind. Play therapy helps younger children express unspoken fears; CBT teaches older kids to challenge distorted thoughts (“They’re laughing at me” → “Maybe they’re talking about lunch”). Crucially, effective therapy addresses root causes—not just behavior suppression. Look for providers certified in trauma-informed care or school-based intervention models.

Common Myths About Bullying

Myth #1: “Bullies are just mean kids with low empathy.”
Reality: Most children who bully score average-to-high on empathy tests—but struggle with *cognitive empathy* (understanding others’ perspectives) and *affective empathy* (feeling others’ emotions) under stress. Their empathy circuits are intact but inaccessible during dysregulation. Punishment shuts down access further; co-regulation rebuilds it.

Myth #2: “Telling kids to ‘just stand up for themselves’ stops bullying.”
Reality: This advice backfires. Research from the University of Illinois shows 78% of targets who confronted bullies directly experienced escalation. Effective strategies are subtle: walking away with confident posture, using humor (“Wow, that’s creative!”), or recruiting allies. Teaching assertiveness—not aggression—is key.

Conclusion & Your Next Step

Understanding why do kids bully other kids isn’t about assigning blame—it’s about decoding distress signals. Whether it’s an overloaded nervous system, unprocessed shame, or a desperate bid for belonging, bullying behavior is always communicating something vital. The most powerful thing you can do today isn’t to ‘fix’ your child—but to deepen your curiosity. Try this: Tonight, ask one open-ended question without judgment: “What’s the hardest part about fitting in at school right now?” Listen for 90 seconds without interrupting. That tiny act of witnessed vulnerability? It’s where healing begins. Ready to go deeper? Download our free Parent’s Guide to Bullying Prevention—including printable emotion cards, conversation scripts, and a school advocacy checklist—designed with child psychologists and tested in 12 school districts.