What are side effects of the flu shot?

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DENVER (KDVR) — Colder weather is right around the corner and with it, comes flu season.

While the COVID-19 vaccine is on the minds of many, it’s also that time of the year to get a flu vaccine.

If you’re planning on getting a flu vaccine, there’s a chance you could experience side effects.

The Centers for Disease Control and Prevention said the good news is that the side effects are generally mild and go away within a few days.


Common side effects

Here are the common side effects from the flue shot, according to the CDC:

  • Soreness, redness, and/or swelling from the shot
  • Headache
  • Fever
  • Nausea
  • Muscle aches
  • The flu shot, like other injections, can occasionally cause fainting.
  • The CDC also said that some studies have found a possible small association of injectable flu vaccine with Guillain-Barré syndrome

Possible allergic reactions

The CDC said that with any vaccine, you should keep an eye open for any unusual conditions, such as a high fever, behavior changes, or signs of a severe allergic reaction after getting your vaccination.

Here are the signs of a severe allergic reaction, according to the CDC:

  • Difficulty breathing
  • Hoarseness or wheezing
  • Swelling around the eyes or lips
  • Hives
  • Paleness
  • Weakness
  • A fast heart beat or dizziness

The CDC said life-threatening allergic reactions to the flu shot are rare. If you’re experiencing a severe allergic reaction, the signs would most likely happen within a few minutes to a few hours after the vaccine is given.

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