Many times behaviour problems are associated with children with autism. These can include incidents of tantrums, self injury, property destruction, and acts of aggression. Some behaviours are the result of developmental deficits (e.g. a child cannot speak and engages in misbehaviour as a form of communication), some could be due to sensory processing challenges and some may be due to physical pain or a medical issue.
It is important to remember that behaviour is communication and it is imperative to try to decipher what the person is trying to say.