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Seafood is a group of foods rich in nutritional value, becoming a "favorite" dish of many people. However, this is a type of food that easily causes allergies. Recognizing the symptoms, understanding the causes and how to treat seafood allergies will help you come up with a quick and effective treatment plan when necessary. 1. WHAT IS SEAFOOD ALLERGY? Seafood allergy is an overreaction of the immune system to proteins in seafood, especially allergies to shellfish such as shrimp, crab, clams, oysters, etc. Depending on the body, some people will react to all types of seafood, but some people will only react to certain types. Not only eating directly causes allergies, but even inhaling the smoke from seafood or coming into contact with surfaces contaminated with seafood can also cause allergic symptoms. 2. SYMPTOMS OF SEAFOOD ALLERGY So how long does it take to get an allergy after eating seafood? According to (suckhoedoisong.vn), the symptoms of seafood allergies are very diverse and often occur very quickly, just a few hours after eating, some people only ten minutes. Allergic reactions do not depend on the amount eaten, but on the sensitivity of each individual. 2.1. Mild allergy Itching, hives, red skin. Headache, dizziness. Sneezing, stuffy nose, runny nose. 2.2. Moderate allergy Seafood allergy causes facial swelling, seafood allergy causes eye swelling. Chest tightness. Abdominal pain, diarrhea. Nausea, vomiting. 2.3. Severe allergy At a severe level, symptoms of anaphylactic shock will appear and if not treated promptly, it can lead to death. Symptoms of anaphylactic shock include: – Cold, pale skin. – Rapid, thin pulse with purple veins. – Low blood pressure. – Cardiovascular collapse. – Laryngospasm. – Unconsciousness. In addition, allergies also trigger symptoms of the disease: atopic dermatitis, eczema, asthma, allergic rhinitis. 3. CAUSES OF SEAFOOD ALLERGY – Seafood contains high levels of protein, including “foreign” proteins. When entering the body, this type of protein is recognized by the body as an antigen. This causes the body’s immune system to react by creating antibodies, causing allergic symptoms. – Proteins in some types of seafood act as semi-antigens. When entering the body, they combine with existing antigen-determining groups, leading to allergies. – In addition, seafood contains histamine, which is an allergen. – Depending on the type and living environment, seafood contains different toxins. Some toxins are not destroyed by cooking temperature or normal processing methods. Therefore, when entering the body, they will cause allergies.