Delusional disorder, previously called paranoid disorder, is a type of ... Somatic: They believe they have a physical defect or medical problem.MenuMedicalReferenceFeaturesSlideshows&ImagesNewsArchiveNewsReferenceSlideshowsVideosQuestions&AnswersMedicationsCrisisAssistanceFindaPsychiatristOverview&FactsSymptoms&TypesTests&DiagnosisMedication&TherapyRisks&ComplicationsSupport&ResourcesAnxiety/PanicDisordersBipolarDisorderDrugInteractionCheckerMentalHealthPsychoticDepressionSchizoaffectiveDisorderSchizophreniformDisorderSmokingCessationSchizophreniaGuideMenuReviewedbyJenniferCasarella, MDonDecember13,2020InthisArticleTypesofDelusionsinDelusionalDisordersWhatAretheSymptomsofDelusionalDisorder?WhataretheCausesandRiskFactorsforDelusionalDisorder?HowIsDelusionalDisorderDiagnosed?HowIsDelusionalDisorderTreated?WhatAretheComplicationsofDelusionalDisorder?What'stheOutlookforPeopleWithDelusionalDisorder?CanDelusionalDisorderBePrevented?Delusionaldisorder,previouslycalledparanoiddisorder,isatypeofseriousmentalillnesscalledapsychoticdisorder.Peoplewhohaveitcan’ttellwhat’srealfromwhatisimagined.Delusionsarethemainsymptomofdelusionaldisorder.They’reunshakablebeliefsinsomethingthatisn’ttrueorbasedonreality.Butthatdoesn’tmeanthey’recompletelyunrealistic.Delusionaldisorderinvolvesdelusionsthataren’tbizarre,havingtodowithsituationsthatcouldhappeninreallife,likebeingfollowed,poisoned,deceived,conspiredagainst,orlovedfromadistance.Thesedelusionsusuallyinvolvemistakenperceptionsorexperiences.Butinreality,thesituationsareeithernottrueatallorhighlyexaggerated.Abizarredelusion,bycontrast,issomethingthatcouldneverhappeninreallife,suchasbeingclonedbyaliensorhavingyourthoughtsbroadcastonTV.Apersonwhohassuchthoughtsmightbeconsidereddelusionalwithbizarre-typedelusions.Peoplewithdelusionaldisorderoftencancontinuetosocializeandfunctionnormally,apartfromthesubjectoftheirdelusion,andgenerallydonotbehaveinanobviouslyoddorbizarremanner.Thisisunlikepeoplewithotherpsychoticdisorders,whoalsomighthavedel