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Living with a Shellfish Allergy

An estimated 2.3% of Americans, that’s nearly 7 million people, are allergic to seafood, including fish and shellfish.  Shrimp, crab and lobster cause most shellfish allergies.

Allergy to shellfish is considered lifelong; once a person develops the allergy, it is unlikely that they will lose it.
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Approximately 60% of those with shellfish allergy first experienced an allergic reaction as an adult.  To avoid a reaction, strict avoidance of seafood and seafood products is essential.  Always read ingredient labels to identify shellfish ingredients.  In addition, avoid touching shellfish, going to the fish market, and being in an area where shellfish are being cooked (the protein in the steam may present a risk).

Keep in Mind

Commonly Asked questions

Should carrageenan be avoided by a fish-allergic individual?

Carrageenan is not a fish.  Carrageenan, or “Irish Moss” is a red marine algae.  This food product is used in a wide variety of foods, particularly dairy foods, as an emulsifier, “stabilizer, and thickener.  It appears safe for most individuals with food allergies.  Carrageenan is not related to fish and does not need to be avoided by those with food allergies.

Should iodine be avoided by a fish-allergic individual?

Allergy to iodine, allergy to radiocontrast material (used in some radiographic procedures), and allergy to fish or shellfish are not related.  If you have an allergy to fish, you do not need to worry about cross reactions with radiocontrast material or iodine.

How to Read a Label for a Shellfish-Free Diet

All FDA-regulated manufactured food products that contain a crustaccan shellfish as an ingredient are required by U.S. law to list the specific crustaccan shellfish on the product label.

Avoid foods that contain shellfish or any of these ingredients:


Crawfish (crayfish, ecrevisse)

Lobster (langouste, langoustine, scamp, coral, tomalley)


Shrimp (crevette)

Mollusks are not considered major allergens under food labeling laws and may not be fully disclosed on a product label.

Your doctor may advise you to avoid mollusks or these ingredients:


Clams (cherrystone, littleneck, pismo, quahog)

Cockle (periwinkle, sea urchin)




Snails (escargot)

Squid (calamari)

Shellfish are sometimes found in the following:


Cuttlefish ink

Fish stock

Seafood flavoring (e.g. cram or clam extract)