Fever: Some people have a mild, low-grade fever within the first 24 hours or so after getting their flu shot.Like other side effects, this should let up within a couple of days. Mild headache: A mild headache may set in the day of your flu shot.Dizziness or fainting: Needles can be scary, and some people might become lightheaded or even faint due to anxiety or nerves about getting poked.Redness or swelling near the injection site: Your arm might be reddened and look larger or puffier than normal due to inflammation.Soreness near the injection site: You might have a dull ache and some mild swelling due to inflammation in the area where you received your flu shot.Here are the most common ones you might experience: Sometimes your immune system does this without causing noticeable symptoms, but other times, you’ll experience a few minor side effects as a result. It usually takes about two weeks for those to kick in and offer you protection, per the CDC. “Your immune system will start to rev up in response.” These dead, partial, and weakened viruses are enough to provoke your immune system to develop antibodies to guard you against live and threatening flu viruses. Adalja, M.D., senior scholar at the Johns Hopkins Center for Health Security, tells SELF. “When you get any type of vaccine, the whole purpose is to expose your immune system to the virus,” infectious disease expert Amesh A. Neither form of the vaccine contains live flu viruses that can thrive in your body. Here’s how it works: The flu shot contains inactivated (completely dead) or incomplete strains of the influenza virus, while the nasal spray contains live attenuated (weakened) strains. You might think that side effects are a bad thing, but they’re actually signs that your immune system is responding and getting ready to protect you. What are common flu vaccine side effects to expect?Īccording to the CDC, you may experience short-lived, minor side effects of the flu shot or nasal spray vaccine-as is the case with any vaccination or medication.
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