Shellfish allergy

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Definition

Shellfish allergy is one of the most common food allergies, affecting about 2 percent of people in the United States. It is most common in adults, but can also occur in children. Symptoms of shellfish allergy can range from hives, vomiting or nasal congestion to more-severe and even life-threatening symptoms. For some people, even a tiny amount of shellfish can cause a serious reaction.

Shellfish includes animals with shells, such as clams, lobster and shrimp, as well as octopus and squid. You may only be allergic to some kinds of shellfish, or you may need to avoid all shellfish. While over-the-counter and prescription medications can help control symptoms, the best way to prevent an allergic reaction is to avoid the type of food that causes it.

If you or your child has a reaction to shellfish, tell your doctor about it, no matter how mild the reaction may have been. Tests can help confirm a shellfish allergy, so you can take steps to avoid future and potentially more-severe reactions.

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Symptoms