What Is a Rebound Food Allergy Reaction?
A rebound food allergy reaction is when you have allergy symptoms again after the first reaction goes away. This is known as a “biphasic reaction.” These symptoms typically happen around 1 to 8 hours after the first reaction. But they can happen up to 72 hours later.
It is important for emergency department staff to monitor you for a longer time after a first reaction. This is to make sure that any biphasic reactions are quickly spotted and treated. This is especially important in cases of anaphylaxis (a severe allergic reaction) due to a food allergen. The risk of a biphasic reaction can make treatment harder. You may need longer observation and treatment.
Let your doctor know if you have ever had a biphasic reaction. This can impact your emergency care plan for allergic reactions.
John M. James, MD, is a board-certified allergist. He is also President of Food Allergy Consulting and Education Services, LLC. He has worked as a medical specialist in the field of allergy, asthma, and immunology for over 30 years. Dr. James received his bachelor’s degree from the University of Arkansas and his Doctor of Medicine degree from the University of Tennessee. He is board certified by the American Board of Allergy and Immunology.
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