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Most Common Flu Shot Side Effects


Serious side effects
Serious side effects are rare with the flu shot, but they can include:

  • High fever. A fever greater than 101°F is not common. If you’re concerned about a high fever, call your doctor.
  • Severe allergic reactions. Rarely, the flu vaccine can cause a severe allergic reaction. Severe allergic reactions usually happen within a few hours of receiving the vaccine.

Symptoms include:

  • hives
  • swelling
  • trouble breathing
  • fast heart rate
  • dizziness
  • weakness

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