Allergic reaction: In the course of normal activities, if a person has a rapid immune response to something or some activity, that would be an allergic-type of reaction. The person might have eaten, drank, breathed in, or had skin contact with an allergen. Also, some people get reactions due to exercise or big emotional changes. Catching an infection in a natural way, would not cause symptoms in that short a time.
Answered 11/28/2017
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