Common vaccine side effects

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Learn about common vaccine side effects and how to treat them.

Key points

  • The risks of vaccines are much lower than the risks of the diseases that they prevent.
  • The most common vaccine side effects are mild and may include temporary pain, redness or swelling in the area where the shot was given, muscle aches, fatigue and fever.
  • Serious side effects, such as allergic reactions, are very rare. If your child is showing serious side effects, or if you are worried, contact your child's doctor or go to the nearest Emergency Department.
Last updated: June 22nd 2023