Unwanted, aggressive behavior among school aged children that involves a real or perceived power imbalance. The behavior is repeated, or has the potential to be repeated, over time. About 1/5 (8.2 million) US high school students report experiences with bullying every year (1/6 for cyberbulling).
Kids who are bullied are more likely to experience:
Depression, anxiety, increased feelings of sadness and loneliness, changes in sleep and eating patterns, health complaints, and loss of interest in activities they used to enjoy.
Decreased academic achievement and school participation. They are more likely to miss, skip, or drop out of school.