Delusions of grandeur is when one has a false belief about one's own greatness or skills. Learn the signs of this mental illness, see a few ...MenuNewsReferenceSlideshowsVideosQuestions&AnswersMedicationsCrisisAssistanceFindaPsychiatristOverview&FactsSymptoms&TypesTests&DiagnosisMedication&TherapyRisks&ComplicationsSupport&ResourcesAnxiety/PanicDisordersBipolarDisorderDrugInteractionCheckerMentalHealthPsychoticDepressionSchizoaffectiveDisorderSchizophreniformDisorderSmokingCessationSchizophreniaReferenceMenuReviewedbySmithaBhandari, MDonNovember20,2019InthisArticleSymptomsCausesDiagnosisTreatmentDelusionaldisorderisaseriousmentalillnesswhereyoucan’ttellthedifferencebetweenwhat’srealandwhat’snot.Delusions,orfalsebeliefs,comesinseveraltypes.Delusionsofgrandeurareoneofthemorecommonones.It’swhenyoubelievethatyouhavemorepower,wealth,smarts,orothergrandtraitsthanistrue.Somepeoplemistakenlycallit“illusions”ofgrandeur.Somedelusionsmightbeabouteventsthatpossiblycouldhavehappened,butactuallydidn’torwereexaggerated.Otherdelusionsareclearlybizarre,suchasinsistingthatanalienlivesinyourfridge.SymptomsEvensomehealthypeoplecanholdunreasonablyhighopinionsofthemselves.Butunlikethem,someonewithgrandiosedelusionsisunshakablyconvincedthattheirdelusionsaretrue.Forexample,youmaybelievethatyou:AreamultimillionaireFoundacureforcancerArerelatedtoaHollywoodcelebrityOthersymptomsmayinclude:Changeinyourmood.Youmaybeirritable,angry,orfeellow.ContinuedHallucinations.Yousee,hear,orfeelthingsconnectedtoyourdelusionthataren’treallythere.Forexample,ifyoubelievethatyouhaveaspecialrelationshipwithGod,youmayhearGod’svoice.Hallucinationsaren’tverycommonwithdelusionaldisorders,andtheytendnottolastlong.Otherthanthedelusion,someonewiththisconditiondoesn’tusuallyseemoractodd.Butsometimes,thedelusionscangetseriousenoughtocauseproblemsintheirdailylife.CausesResearchersdon’tknowexactlywhatcausesdelusions.Sometimes,delusionsofgrandeurcanbeasymptomofanothermentalillnesses,includingbipolardisorderandschizophrenia.