Paranoid schizophrenia used to be considered a subtype of schizophrenia, but this is no longer the case. While paranoia is a common symptom, not everyone experiences it. The different types of schizophrenia include hebephrenic schizophrenia (disorganized schizophrenia), residual schizophrenia, and catatonic schizophrenia. There is also undifferentiated schizophrenia, which is a collection of multiple symptoms that do not cleanly fit into an existing subtype.