The health woes of the world's most high-profile leaders are always cause for concern. These are the people who make some of the most important decisions affecting society, and whether it's a president, prime minister, or pope, their well-being is vital in maintaining national policy and public confidence in the office they hold. But just how healthy are some of those currently in charge of countries and states, and what happened to past leaders whose ill health threatened the security and stability of their nations?
Click through this gallery for a worrying diagnosis.