Delusional disorder, also known as paranoia disorder, is a relatively uncommon condition. Delusional disorder patients have delusions but do not have hallucinations, mood or thought disturbances, or any primary signs of mental illnesses such as schizophrenia.
These delusions are also another type of insanity in which a person believes that something has happened, ( will happen or is happening) that is not true. These delusions are often delusional – for example, the individual might believe they are being watched. Delusional disorder does not necessarily make it difficult for a person to act normally, but it has the potential to do so. Delusional disorder is divided into many subtypes.