Seafood allergies are one of the most common types of food allergies worldwide. They occur when the immune system overreacts to proteins found in certain types of fish or shellfish. Reactions can range from mild skin irritation to severe, life-threatening anaphylaxis.

What Causes Seafood Allergies?

Seafood allergies develop when the body mistakenly identifies proteins in seafood as harmful. This triggers the release of histamine and other chemicals, leading to allergic symptoms.

The most common seafood allergens include:

• Fin fish: salmon, tuna, cod

• Shellfish: shrimp, crab, lobster

• Mollusks: clams, oysters, mussels

• Other sources: fish roe (eggs) and fish sauce

Important: Being allergic to one type of seafood doesn’t always mean you’ll react to all. For example, some people allergic to shrimp may tolerate crab or lobster.

Seafood Allergy Symptoms

Seafood allergy symptoms can appear within minutes to hours after eating seafood. They may include:

• Itching or hives

• Swelling of lips, face, or throat

• Wheezing or shortness of breath

• Abdominal pain, nausea, or vomiting

• Anaphylaxis: a severe, potentially fatal reaction requiring emergency care

Diagnosis of Seafood Allergies

An allergist may use the following tests:

• Medical history review (symptom patterns)

• Skin prick test

• Blood test (IgE levels)

• Oral food challenge (performed under medical supervision)

Treatment & Management

Currently, there is no cure for seafood allergies. The most effective management strategy is strict avoidance of the trigger foods.

Tips for managing seafood allergies:

• Always read food labels carefully, as seafood can be hidden in sauces, broths, or processed foods.

• When dining out, inform the restaurant staff about your allergy.

• Carry an epinephrine auto-injector (EpiPen) if prescribed, for emergency use in case of accidental exposure.

• Some individuals may tolerate cooked seafood but not raw forms – only attempt this under medical supervision.

Seafood Allergy vs. Seafood Poisoning

It’s important to note the difference:

• Seafood allergy = immune system reaction to seafood proteins.

• Seafood poisoning = illness caused by bacteria, viruses, or toxins in contaminated seafood.

Seafood poisoning often causes nausea, diarrhea, and fever, but it is not an allergic reaction.

Final Word

Seafood allergies can be serious and lifelong, but with proper management, individuals can live safely and confidently. If you suspect you have a seafood allergy, consult an allergist for testing and personalized treatment.