Not all types of schizophrenia involve hallucinations, according to Psych Central. The people who are most likely to experience hallucinations are those who are diagnosed as having either paranoid or disorganized schizophrenia.
Psych Central lists four major diagnoses of schizophrenia: paranoid, disorganized, undifferentiated and residual. The defining feature of the paranoid schizophrenic is auditory hallucinations or prominent delusional thoughts. The disorganized schizophrenic can also experience hallucinations, but this is secondary to the predominant feature of disorganized thought processes. Those with catatonic, undifferentiated and residual schizophrenia typically do not experience hallucinations, although they can occur in certain scenarios. Those with the undifferentiated subtype of schizophrenia are particularly prone to the occasional onset of hallucinations.