Most commonly, though, kids become aggressive because they've witnessed aggression in others. Whatever the reason, if you get your child help now, you can prevent more serious problems later on. If your child's aggressive behavior is frequent and severe, or your efforts to curb it have no effect, you'll need to consult your child's physician or a trained mental health professional, such as a child psychologist or psychiatrist. All children occasionally shove a sibling who's mocking them or kick the couch when their parents say they can't go to the movies. An aggressive child will act this way in more than one arena, such as school, home, and social events or athletic activities.
Physical fear is one straightforward explanation.
If your child feels cornered by another child, for example, he might lash out. Family difficulties or discord. Children often act out in response to family strife, whether it's battling parents, a sibling who teases relentlessly, a move to a new area, serious illness in the family, or the loss of the breadwinner's job. Such tensions and changes stress children as well as parents, and some kids react by becoming belligerent or destructive, especially if other family members are releasing their feelings in similar ways. If your child has a problem that makes it difficult for him to read, write, or understand spoken language, he might vent his frustration physically.