Factitious disorder, more commonly known as Munchausen syndrome, is a mental health disorder in which people fake serious illness to gain sympathy, attention and support. A related disorder, Munchausen by proxy, or factitious disorder imposed on another, is a form of abuse in which caregivers make up or induce illness in their children. Psychiatrist Marc Feldman, MD, and psychologist Janet Cahill, PhD, discuss researchers’ evolving understanding of these disorders, how common they are, the phenomenon of “Munchausen by internet” where people lie to strangers online, and whether there are any effective therapies for these disorders. For transcripts, links and more information, please visit the Speaking of Psychology Homepage.