Can autism make a child violent or aggressive?

Yes: But keep in mind most people with autism are not aggressive. Aggressive episodes can be triggered by changes in routine, overwhelming anxiety, someone not allowing the person to engage in his or her desired behavior, or being in pain (e.g. Having an ear infection). Aggression in autism can also sometimes take the form of the person being aggressive to him/herself (self injurious behavior).

Yes: Medications have recently been fda approved to treat aggression in autism. You should consult a child psychiatrist or pediatrician who is familiar with autism.