Bullying changes people physically, mentally, and academically, and the effects often persist long after the bullying itself stops. Teenagers who are bullied are nearly twice as likely to experience symptoms of anxiety and depression compared to those who aren’t. But the damage goes deeper than mood. Bullying reshapes how the body handles stress, how the brain develops during critical years, and how a person sees themselves well into adulthood.
Anxiety, Depression, and Self-Worth
The mental health toll of bullying is well documented. National data from the CDC covering 2021 to 2023 found that 29.8% of bullied teenagers reported anxiety symptoms in the prior two weeks, compared to 14.5% of teens who weren’t bullied. Depression rates showed a similar gap: 28.5% among bullied teens versus 12.1% among their peers. These aren’t small differences. Being bullied roughly doubles the likelihood of clinically meaningful mental health symptoms during adolescence.
Beyond anxiety and depression, bullying erodes self-esteem and increases emotional instability. Research comparing victims to peers who weren’t bullied found that victims scored significantly lower on measures of self-worth and significantly higher on feelings of rejection and emotional dysregulation. Victims also reported a higher frequency of suicidal thoughts. These patterns aren’t limited to the teenage years. Longitudinal research shows that the negative psychological effects of bullying can persist into adulthood, shaping how people relate to others, handle conflict, and view themselves decades later.
How Bullying Changes the Stress Response
Your body has a built-in system for responding to threats. When something stressful happens, cortisol (your primary stress hormone) spikes, helps you deal with the situation, and then drops back to normal. In a healthy pattern, cortisol peaks about 20 to 30 minutes after waking and gradually declines through the day.
Bullying disrupts this cycle. A study of 107 adolescents found that peer victimization predicted a flattened cortisol awakening response, meaning the body’s natural morning cortisol surge was blunted. This matters because that flattened response acts as a bridge between bullying and physical health problems. Bullied adolescents also showed altered cortisol patterns under laboratory stress: higher cortisol immediately after a stressor, then a sharper drop 30 minutes later. Both of those irregular patterns were linked to more health problems.
Adolescence is a particularly vulnerable window for this kind of disruption. The body’s stress system is actively recalibrating during puberty, and the brain is undergoing rapid maturation. Chronic social stress during this period can essentially retrain the stress response to be less adaptive, setting the stage for health issues that outlast the bullying itself.
Physical Health Symptoms
Bullying doesn’t just feel bad emotionally. It shows up in the body. The most common physical complaints among adolescents under chronic stress include headaches, stomachaches, back pain, and persistent morning fatigue. Among adolescent girls in the U.S., more than 29% report frequent headaches and over 20% report recurring stomachaches. While these symptoms have multiple causes, the connection between chronic social stress and physical pain is well established. The altered cortisol patterns described above help explain why: when the body’s stress regulation system is disrupted, inflammation increases and immune function suffers, producing real, measurable physical symptoms.
The flattened cortisol response seen in bullied teens doesn’t just correlate with poor health in studies. It statistically mediates the relationship, meaning the hormonal disruption is part of the mechanism through which bullying produces physical illness. Bullied adolescents visit healthcare providers more often, and their complaints are genuine physiological responses to sustained stress.
Academic Performance
Grades suffer measurably when a student is being bullied. Research from UCLA tracked the relationship between bullying severity and academic performance across all three years of middle school. The findings were striking: a one-point increase on a four-point bullying severity scale was associated with a 1.5-point drop in GPA for a single academic subject like math. That’s the difference between an A and a C, driven not by ability but by the psychological weight of victimization.
This makes intuitive sense. A student spending mental energy on fear, social threat monitoring, and emotional recovery has less capacity for learning. Physical symptoms like headaches and fatigue compound the problem by increasing absences. The academic damage can snowball, with lower grades feeding back into lower self-esteem and reduced motivation.
Cyberbullying Carries Distinct Risks
Online harassment isn’t simply traditional bullying in a digital wrapper. It carries unique characteristics that can intensify the psychological damage: the invasion of privacy feels more severe, harmful content spreads faster than anyone can control it, the perpetrator can remain anonymous, and there’s far less adult supervision. There is no safe space to retreat to when the bullying follows you home on your phone.
These features translate into measurably worse outcomes. Adolescents who experience cyberbullying are more likely to engage in self-harm and attempt suicide compared to those who experience direct or relational bullying in person. This pattern holds for both boys and girls. While traditional bullying certainly causes significant harm, the data consistently show that cyberbullying victimization has stronger associations with the most severe outcomes.
Bullying Can Produce Trauma Symptoms
Repeated bullying, whether online or offline, can produce symptoms that look a lot like post-traumatic stress: intrusive memories that feel like they’re happening again in the present moment, avoidance of anything that triggers reminders, and a persistent sense of being under threat. These are the core features of PTSD as defined by the World Health Organization’s diagnostic framework.
Under the current international diagnostic guidelines (ICD-11), there is no strict requirement that a traumatic event involve physical danger. The guidance states that PTSD or complex PTSD may follow “an extremely threatening or horrific event or series of events,” which can include psychologically threatening experiences like emotional abuse, neglect, or repeated bullying. In one study, being “repeatedly bullied online or offline” was significantly associated with meeting the criteria for complex PTSD, a condition that includes not only the core trauma symptoms but also problems with emotional regulation, self-concept, and relationships. Being made to feel “unloved, unwelcome, or worthless,” experiences central to many bullying dynamics, carried an even stronger association.
This is important because people who were bullied sometimes struggle to understand why they still feel affected years later. Recognizing that bullying can produce genuine trauma responses validates that experience and points toward effective treatment approaches.
Effects on People Who Bully Others
The consequences of bullying aren’t limited to victims. People who bully others also face long-term risks, though their profile looks different. Research shows that aggressors tend to have lower emotional sensitivity and higher reward-seeking behavior compared to peers. They score higher on communication and social skills, which they use instrumentally, but lower on psychological adjustment overall.
Perhaps surprisingly, aggressors and victims don’t differ significantly in their rates of substance use. Both groups show elevated consumption compared to peers who weren’t involved in bullying at all. The research consistently frames bullying as a stressful experience for everyone involved, with depression, anxiety, low self-esteem, and suicidal ideation appearing across both aggressor and victim profiles, though victims bear the heavier burden.
Effects on Bystanders
Witnessing bullying takes a psychological toll even when you’re not the target. Bystanders commonly experience fear of retaliation (worry that stepping in will make them the next target) and anxiety about losing social status. These fears create a kind of paralysis that carries its own emotional cost. Watching someone be harmed while feeling unable or unwilling to act can produce guilt, helplessness, and a diminished sense of safety in environments like schools or workplaces. The ripple effect of bullying extends well beyond the two people directly involved, shaping the emotional climate for entire communities.