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How long does an allergic reaction to a vaccine last?
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Dr. Barbara Stark Baxter
Internal Medicine - Allergy & Immunology
In brief: Vaccine reactions
The duration of an allergic reaction to a vaccine depends on the type of allergic reaction and on the person having the reaction.
Reactions like classic allergies, ie hives or "urticaria" may last a few days, whereas those that are more serum sickness-like, with joint pains, sometimes last longer, like weeks or months, and require treatment with steroids. Most reactions are short-lived.

In brief: Vaccine reactions
The duration of an allergic reaction to a vaccine depends on the type of allergic reaction and on the person having the reaction.
Reactions like classic allergies, ie hives or "urticaria" may last a few days, whereas those that are more serum sickness-like, with joint pains, sometimes last longer, like weeks or months, and require treatment with steroids. Most reactions are short-lived.
Dr. Barbara Stark Baxter
Dr. Barbara Stark Baxter
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