Factitious disorders.

Reports of factitious disorders, Munchausen's syndrome, and self-induced illness exist throughout medical history. In practice, disease simulation represents a spectrum of behaviors that range from relatively common and benign (e.g., pleading illness to avoid an unwanted social obligation) to rare and malignant forms (e.g., Munchausen's syndrome and factitious disorder by proxy). Factitious disorders are differentiated from malingering by the goal that motivates the individual's behavior. The only apparent goal in factitious illness is to gain the sick role; the goal in malingering is to gain rewards, such as compensation, or to avoid the unwanted, such as military service or jail. This article summarizes clinically relevant information on factitious disorders for primary care physicians.