Crayfish allergy is an allergic reaction to proteins found in crayfish, a type of shellfish. It can range from mild to severe and, in some cases, be potentially life-threatening. People with a crayfish allergy may react not only from eating crayfish but also from inhaling steam released during cooking.
People with a crayfish allergy often have allergies to other types of shellfish. Cross-reactivity can occur with: