(HealthDay News) -- Children may act out in an aggressive way because they're frustrated or just don't know how to express their emotions. But there are times when it's wise for a parent to call the pediatrician during an aggressive outburst.

The American Academy of Pediatricians says you should call the child's doctor if:

• Aggression causes physical injury to other people or himself/herself.
• Aggression lasts longer than a few weeks, and you are unable to manage your child's behavior.
• Your child attacks you or someone else.
• Your child is sent home from school or is barred from playtime as a result of aggression.
• You feel afraid for your safety.