Shellfish Allergy Overview

Allergy to shellfish cause an allergic reaction to eating seafood. Sometimes an allergy to shellfish is only certain types of seafood, or you may have an allergy to shellfish. The mollusks are marine animals with shells, such as shrimp, crab and lobster, octopus and squid.

Allergies to shellfish can cause mild symptoms such as hives or nasal congestion, or more severe symptoms or death. For some people, even a small amount of these foods can cause a serious reaction.

If you think you have an allergy to shellfish, consult your doctor. Tests can help confirm a shellfish allergy, so you can take steps to prevent future reactions.