It is possible for a young teen to have schizophrenia. Early onset schizophrenia (diagnosed before the age of 18) accounts for about 10% of all schizophrenia cases. The symptoms can be difficult to identify, since some of the behaviors seen in early onset schizophrenia are also common in teens who are simply going through a normal stage of development. Some of the symptoms that may suggest early onset schizophrenia include changes in mood, social withdrawal, problems with school or work, decreased communication skills, and strange thoughts or beliefs. If you think your teen may be experiencing these symptoms, it's important to talk to a doctor as soon as possible. Schizophrenia is a serious mental illness that requires treatment.