Though people of any age can develop shellfish allergy, it's more common in adults. You're at increased risk of developing shellfish allergy if allergies of any type are common in your family. Your health care provider can help you determine what is safe to eat. Some people who are allergic to shellfish may still be able to eat fish, or they could be allergic to both. Other people with shellfish allergy must avoid all shellfish.Īn allergy to fish - such as salmon, tuna or catfish - is a different seafood allergy from an allergy to shellfish. Some people are allergic to only one type of shellfish but can eat others. Mollusks include squid, octopus, mussels, snails, clams, oysters, abalone and scallopsĪn allergy to crustaceans is the most common type.Crustaceans include crabs, lobster, crayfish, shrimp and prawn.There are several types of shellfish, each containing different proteins: This causes a reaction that leads to the symptoms of an allergic reaction. The next time you come in contact with the shellfish protein, these antibodies signal your immune system to release chemicals such as histamine into your bloodstream. Your immune system is how your body protects itself, so it produces immunoglobulin E (IgE) antibodies to protect against this allergen. In shellfish allergy, your immune system mistakenly identifies a certain protein in shellfish as harmful. Your immune system identifies a harmless substance as being harmful. See a health care provider or allergy specialist if you have food allergy symptoms shortly after eating.Īll food allergies are caused by an immune system overreaction. Seek emergency treatment if you develop signs or symptoms of anaphylaxis. Severe skin rash, hives, itching or swelling.Shock, with a severe drop in your blood pressure and a rapid or weak pulse.Coughing, choking or wheezing with trouble breathing.A swollen throat or tongue or a tightness in the throat (airway constriction) that makes it difficult for you to breathe. Signs and symptoms of anaphylaxis include: If anaphylaxis isn't treated right away, it can be fatal.Īnaphylaxis causes the immune system to release a flood of chemicals that can cause you to go into shock. Anaphylaxis requires immediate treatment with an epinephrine (adrenaline) injection and a follow-up trip to the emergency room. It can occur within seconds to minutes after exposure to something you're allergic to - and worsens quickly.Īn anaphylactic reaction to shellfish is a medical emergency.
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