If you travel enough, inevitably there will be a time where you have to fly while sick or injured.  Or, even worse, where you get sick WHILE flying (probably shouldn't have eaten those shrimp tacos before the flight)!  Being stuffed in a metal tube with stale air and hundreds of other people is never ideal, but here's a few things you can do to make it more bearable when you are sick or injured - including a few that most people don't know about.