There are many different causes that can take people to start bullying against other people, the most usual reason is that a person thinks different or looks different from the rest, so the group start to discriminate the person that is "different" from the others. This is usually more frequent in kids that have problems to socialize with others, or kids that dont have good grades. Also happens when a kid (or adult) has problems in their house so this make them to be stressed all the time and to have a bad realtion with the others.
The bullying is usually against to someone that has less posibilities of defend itself from the abusers.
In the girls, for example is usually against someone that has less beauty or less popular than the others. Its very common in the famous "nerds" because they are smarter than the rest.
By: .Laura Maria Otero Lopez