Reaction at the injection site
The most common flu vaccine side effect is a reaction at the injection site, generally on the upper arm. After it’s given, you might have some redness, soreness, warmth, and, in some rare cases, slight swelling.
These effects usually only last less than a couple of days. To help reduce your discomfort, try taking some ibuprofen before getting your vaccine.
Severe allergic reactions
Seldom times, the flu vaccine can provoke a severe allergic reaction. These reactions usually happen within a few hours of getting the vaccine. Flu vaccine side effects can include:
- Trouble breathing
- Fast heart rate
If you experience any of these flu vaccine side effects, be sure to call your physician right away. And call 911 or go to the closest emergency room if they’re severe.
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