Lycanthropy is a mental disorder where people believe that they are a wolf (or some other animal).  (Incidentally, the dictionary also defines lycanthropy as  – In folklore, the magical ability to assume the form and characteristics of a wolf.)  For those of you interested in learning more about the “werewolf disease”, try searching for The Werewolf in Legend, Fact, and Art by novelist Basil Copper in 1977.  Cooper discusses the werewolf disease and research done by  Dr. Lee Illis who describes the werewolf disease as the mental condition congenital porphyria.  Dr. Illis compiles evidence to show a link between porphyria and werewolves.  Is the werewolf disease legitimate?  You’ll have to do the research and be the judge, however this doctor certainly believes so!