Getting flu shots isn't mandatory for the general public, so it's a good idea to weigh the pros and cons closely before you jump into something that could forever change your life. Some people that get yearly vaccinations never seem to have problems, while others get one and have major complications. So what’s up with that?
Well, for one thing, all people are unique in the sense that we’re all a formation of our own influences, experiences, environment, DNA, etc. No one’s completely the same as another person. Even identical twins have differences that get shaped over time. And those differences - even the most minute - matter when it comes to vaccines! (There are many other considerations as well!)