What is anaphylaxis?

Anaphylaxis is a sudden, severe, potentially fatal, systemic allergic reaction that can involve various areas of the body (such as the skin, respiratory tract, gastrointestinal tract, and cardiovascular system). Symptoms occur within minutes to two hours after contact with the allergy-causing substance but, in rare instances, may occur up to four hours later. Anaphylactic reactions can be mild to life threatening. The annual incidence of anaphylactic reactions is about 30 per 100,000 persons, and individuals with asthma, eczema, or hay fever are at greater relative risk of experiencing anaphylaxis.


Who is at risk for having an anaphylactic reaction?

Anyone with a previous history of anaphylactic reactions is at risk for another severe reaction. Individuals with food allergies (particularly allergies to shellfish, peanuts, and tree nuts) and asthma may be at increased risk for having a life-threatening anaphylactic reaction. A recent study showed that teens with food allergy and asthma appear to be at highest risk for a reaction because they are more likely to dine away from home, they are less likely to carry medications, and they may ignore or not recognize symptoms.



Although an individual could be allergic to any food, such as fruits, vegetables, and meats, there are eight foods that account for 90% of all food-allergic reactions. These are: milk, egg, peanut, tree nut (walnut, cashew, etc.), fish, shellfish, soy, and wheat.

Some people have the misconception that nuts are the only cause of anaphylaxis and that “healthy” food like milk or eggs couldn’t possibly cause death, but an individual may be anaphylactic to any food.


Interactive Chart

Click on the Helathline infographic below to learn more about the side effects of anaphylaxis on the body.


For more information visit: Food Allergy Research & Education 

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