Delusional disorder, as defined in the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders
, Fourth Edition (DSM-IV), refers to a group of conditions in which the central feature is the presence of delusions in the absence of other symptomatology.
* Erotomanic Delusional Disorder: in which the person believes that a person of usually higher status is in love with them
* Grandiose Delusional Disorder: which is delusions of inflated worth, power, knowledge, identity, or special relationships
* Jealous is that where they believe the sexual partner is unfaithful
* Persecutory Delusional Disorder: by which they believe they or someone they are close to is being maltreated
* Somatic Delusional Disorder: in which they believe they have a physical problem, defect, or illness
* Mixed type of Delusional Disorder: in which more than one of the previous types is present.