Fictional diseases are illnesses created for storytelling purposes in literature, film, and video games. These diseases often serve to explore themes of fear, survival, or the human condition. Examples include the T-virus from the Resident Evil series, which turns people into zombies, and Captain Trips from The Stand by Stephen King, a superflu that wipes out most of humanity. These diseases can also reflect real-world concerns, such as pandemics or genetic mutations, allowing creators to comment on societal issues. By using fictional diseases, writers can engage audiences in thought-provoking narratives while providing a safe space to explore complex emotions and scenarios.