Schizophrenia symptoms vary from person to person. There areseveral main types of schizophrenia, and schizophrenia is oftenconfused with other mental illneses, so there are a wide range ofsymptoms.There are three types of schizophrenia symptoms - cognitive,positive and negative. Cognitive symptoms affect thought processes,and are the worst ones to have, since they interfere with normalactivities. These include lack of memory and understanding, andinability to pay attention. Positive symptoms connote distorted orexcessive normal functions. These include hallucinations, delusionsand disorganized thought, speech and behavior. Negative symptomsmean that normal function is absent or diminished. These includelack of interest, motivation and emotion, neglect of personalhygiene and social withdraw