Delusional disorder is an uncommon psychiatric condition in which patients present with
delusions, but with no accompanying prominent
hallucinations, thought disorder, mood disorder, or significant
flattening of affect.
[1][2] Delusions are a specific symptom of
psychosis. Non-bizarre delusions are fixed false beliefs that involve situations that could potentially occur in real life; examples include being followed or poisoned.
[3] Apart from their delusions, people with delusional disorder may continue to socialize and function in a normal manner and their behaviour does not generally seem odd or bizarre.
[4] However, the preoccupation with delusional ideas can be disruptive to their overall lives.
[4] For the diagnosis to be made, auditory and visual hallucinations cannot be prominent, though olfactory or tactile hallucinations related to the content of the delusion may be present.
[5]