A<unk>  is a<unk> al state that concerns only one particular topic. This is contrasted by what is sometimes called multi-thematic or polythematic<unk> s where the person has a range of<unk> s (typically the case of schizophrenia). These disorders can occur within the context of schizophrenia or dementia or they can occur without any other signs of mental illness. When these disorders are found outside the context of mental illness, they are often caused by organic dysfunction as a result of traumatic brain injury, stroke, or neurological illness. People who experience these<unk> s as a result of organic dysfunction often do not have any obvious intellectual deficiency nor do they have any other symptoms. Additionally, a few of these people even have some awareness that their beliefs are bizarre, yet they cannot be persuaded that their beliefs are false.
Monothematic delusion
Homicidal ideation
Grandiose delusions
Mirrored-self misidentification
Intrusive thought
Cotard delusion
Morbid love
Obsessive love