Quarterback is the most important position in American sports and therefore comes with the most stress.
Being the QB also entails being the emotional leader of the offense and sometimes the whole team.
In the NFL, a starting QB has to be more than just an athlete, they have to be the total package to survive not just the opposing defenses, but the press and the fans as well.
If a team doesn't have a franchise quarterback, they are nothing. That being said, if you are the franchise quarterback, you are everything.
Those kind of expectations come with a lot of pressure, the kind you truly have to be a mental heavyweight just to handle on a daily basis.
Here's a countdown of the seven quarterbacks under the most pressure in 2011.