The myth whether werewolves exist is still a myth even after centuries. This enormously dangerous shape-shifting creature hungers for raw meat, and has been used many times in horror movies now. A medical condition.
A famous physician and surgeon, Galen of Pergamon who existed in the second century actually did diagnose somebody being a werewolf. The person is stated to have suffered from a psychiatric syndrome, which is very rare called “Clinical Lycranthopy”. The disease makes the people believe that they can change forms and transform themselves into any creature that is not a human. The name it got came from the mythical world’s word lycranthopy which is the process of a man shifting its shape to a wolf. His patient too was having the bizarre believes that he has or could change himself into a wolf.