Yeah, there has been a lot of concern over the content of swine flu vaccines and many problems have been reported so far. Although normal side effects include vomiting, mild fever, nausea, chills, muscle pain, malaise and headache, there are other major side effects like mercury poisoning too. Although the vaccine does not contain mercury itself, it contains thimerosal, which is a version of mercury. This can cause some undesirable effects over a period of time. People who are allergic to sulfur and eggs should not get vaccinated, along with people who face allergic reactions to vaccinations and pregnant women.