Do all shellfish cause the same reaction?

Do all shellfish cause the same reaction?

Often, if you have an allergy to one type of shellfish, you will have an allergy to other types. Crustaceans cause more allergic reactions than mollusks.

You might have a reaction after eating lobster, for example, but eat scallops without a problem. If you have symptoms after eating shellfish, talk with your healthcare provider or allergist before eating any type of shellfish.