Factitious disorder (FD) is a diagnostic entity in which patients intentionally create false physical or mental symptoms. Although the disorder is rare, having an early diagnose is critical, because it causes unnecessary health expenditures and tends to become chronic. In this article, a case of delusional disorder who had been monitored for 6 years, then hospitalized due to a pre-diagnosis of drug induced movement disorder, and had a final diagnosis of FD was discussed. Through this case report, it was aimed to emphasize the importance of careful monitoring of the patients for preventing unnecessary investigations and treatments.