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What are the possible side effects of a flu injection?

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Quick Answer

Side effects of a flu injection include tiredness, aches, a mild fever and redness, soreness and swelling around the site of the shot, explains WebMD. More serious side effects, though rare, include hives, difficulty breathing, dizziness or a rapid heartbeat.

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Full Answer

There are a number of different flu shots available, including the traditional flu shot, an egg-free flu shot, a high-dose shot and an intradermal flu shot, claims WebMD. The traditional shot goes directly into the muscle, and it contains a number of different inactive flu viruses; however, people who get this shot do not develop the flu. The egg-free flu shot is for those who are allergic to eggs. The high-dose flu shot is for people over the age of 65 who need a stronger dose for protection from the flu.

The intradermal flu shot is for people from the ages of 18 to 64, according to WebMD. This shot uses a tiny needle that the provider only inserts skin deep. As of 2015, the newest option for flu protection is not an injection at all, but a nasal spray. Made of live flu viruses that are weak, this spray is for people who range from the age of two to 49, are not pregnant and have a strong immune system.

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