Bullying involves unwanted aggressive behavior among school-aged children that involves a real or perceived power imbalance. No single factor puts a child at risk, but some groups like LGBT youth may be at higher risk. Children are more likely to be bullied if they are perceived as different, weak, unpopular, or provoke others. Children are more likely to bully if they are aggressive, have issues at home, view violence positively, or have friends who bully. Warning signs of bullying include injuries, changes in eating or sleeping, declining grades, and self-destructive behaviors. Adults can help prevent bullying by talking to children, keeping communication open, encouraging interests and hobbies, and modeling kindness.