Delusional Disorders are a type of psychosis in which the patient experiences persistent false beliefs but can still function reasonably well in society. The delusions are considered “nonbizarre” in that they involve situations that could actually happen in reality, such as being lied to or cheated on by your partner.
The types of delusional disorders are erotomanic, grandiose, jealous, persecutory, somatic, and mixed. For example, in the erotomanic type of delusion, the patient may think that another person, often a celebrity or status figure, is in love with them. In the persecutory type, the patient may be convinced that another person is out to get them or do them harm.
See also: Delusions