DefinitionDisorganized schizophrenia is a type of schizophrenia in which behavior is disturbed and has no purpose.Alternative NamesHebephrenic schizophrenia; Disorganized schizophreniaCauses, incidence, and risk factorsThe cause is unknown. This type of schizophrenia usually begins before age 25.SymptomsActive behavior, but in an aimless and not constructive wayBizarre and inappropriate emotional responsesDifficulty feeling pleasureFalse, fixed beliefs (delusions)Lack of motivationSeeing or hearing things that aren't there (hallucinations)Strange or silly behaviorSpeech that makes no senseSome of these symptoms are also seen in other types of schizophrenia. The main difference is that in disorganized schizophrenia, there is a lot of strange, aimless behavior and often speech that does not