Shellfish is divided into two groups namely, crustaceans and mollusks. Crustacean family includes shrimp, crab, or lobster while mollusks includes clams, mussles, oysters, scallops, octopus, or squid.
A shellfish allergy causes an allergic reaction when you eat shellfish. Some people with shellfish allergies are allergic to both groups, but some might be allergic only to one. The body’s immune system normally fights infections. But when someone is allergic to shellfish, the immune system overreacts to proteins in the shellfish. Every time the person eats shellfish, the body thinks these proteins are harmful invaders.
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