The symptoms of schizophrenia include hallucinations (hearing and seeing things that are not there), delusions (fixed false beliefs); and difficulties in organizing their thoughts. A student may talk and say little substance or the child may have ideas or fears that are odd and unusual (beyond developmental norms). Many, but not all individuals with schizophrenia may show a decline in their personal hygiene, devere lack of motivation, or they may become apathetic or isolative. During adolescence the illness is not fully developed, and thus it is at times difficult to differentiate schizophrenia from a severe depression, substance abuse disorder, or bipolar affective disoder.