Delusional disorder describes a psychiatric condition where the patient suffers from delusions, but does not suffer from hallucinations, thought disorders, mood disorders or a flat affect. The delusions can be either "bizzare" (could not occur in real life) or "non-bizzare" (could occur in real life). Most patients with delusional disorder can function normally, but an increasing obsession over their delusions can often result in a disruption of their life.