what constitutes a severe allergic reaction

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https://www.aafa.org/anaphylaxis-severe-allergic-reaction/

Severe Allergic Reaction: Anaphylaxis | AAFA.org
https://www.aafa.org/anaphylaxis-severe-allergic-reaction/
Anaphylaxis (anna-fih-LACK-sis) is a serious allergic reaction that is rapid in onset and may cause death. What Are the Symptoms of Anaphylaxis? Symptoms usually involve more than one organ system (part of the body), such as the skin or mouth, the lungs, the heart and the gut.

https://www.mayoclinic.org/diseases-conditions/anaphylaxis/symptoms-causes/syc-20351468

Anaphylaxis – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/anaphylaxis/symptoms-causes/syc-20351468
Anaphylaxis is a severe, potentially life-threatening allergic reaction. It can occur within seconds or minutes of exposure to something you’re allergic to, such as peanuts or bee stings.

https://www.healthline.com/health/allergies/severe-allergy-symptoms

Severe Allergy: Symptoms and Treatment
https://www.healthline.com/health/allergies/severe-allergy-symptoms
Severe allergy symptoms are more extreme. Swelling caused by the allergic reaction can spread to the throat and lungs, leading to allergic asthma or a serious condition known as anaphylaxis….

https://parade.com/1077432/carolyncrist/severe-allergy-symptoms/

10 Severe Allergy Symptoms You Should Take Seriously …
https://parade.com/1077432/carolyncrist/severe-allergy-symptoms/
Anaphylaxis is a severe and sometimes fatal allergic reaction that can progress rapidly. People who have particular issues with insect stings and venom, food allergies, or medication allergies may…

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/allergic-reaction.html

COVID-19 Vaccines and Severe Allergic Reactions
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/allergic-reaction.html
An allergic reaction is considered severe when a person needs to be treated with epinephrine or EpiPen © or if they must go to the hospital. Learn about common side effects of COVID-19 vaccines and when to call a doctor. If you have a non-severe allergic reaction to a COVID-19 vaccine

https://www.medicinenet.com/what_are_the_four_types_of_allergic_reactions/article.htm

What Are the Four Types of Allergic Reactions?
https://www.medicinenet.com/what_are_the_four_types_of_allergic_reactions/article.htm
Allergic reactions are exaggerated sensitivities (hypersensitive reactions) that occur when your immune system responds abnormally to common substances such as pollen, dust and certain foods. These substances, called allergens, are harmless in a majority of people.

https://www.mayoclinic.org/diseases-conditions/allergies/symptoms-causes/syc-20351497

Allergies – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/allergies/symptoms-causes/syc-20351497
Allergy symptoms, which depend on the substance involved, can affect your airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, allergies can trigger a life-threatening reaction known as anaphylaxis. Hay fever, also called allergic rhinitis, can cause:

https://www.drugs.com/health-guide/rash.html

Rash Guide: Causes, Symptoms and Treatment Options
https://www.drugs.com/health-guide/rash.html
Allergic reactions — A severe allergic reaction is a life-threatening medical emergency. It must be treated immediately with epinephrine, a medication that opens narrowed airways and raises dangerously low blood pressure. High doses of corticosteroids and antihistamines also are used to suppress the immune system’s reaction.

https://www.thoughtco.com/types-of-hypersensitivity-reactions-4172957

4 Types of Hypersensitivity Reactions – ThoughtCo
https://www.thoughtco.com/types-of-hypersensitivity-reactions-4172957
Allergies can range from mild hay fever to life-threatening anaphylaxis. Anaphylaxis is a serious condition, resulting from inflammation caused by histamine release, that impacts the respiratory and circulatory systems. The systemic inflammation results in low blood pressure and blockage of air passages due to swelling of the throat and tongue.

https://www.everydayhealth.com/allergies/vaccine-allergy.aspx

Vaccine Allergy: A Closer Look – Allergy Center – Everyday …
https://www.everydayhealth.com/allergies/vaccine-allergy.aspx
A vaccine allergy is an extremely rare type of allergy, with only one to two serious allergic reactions being reported per million vaccinations given. But when a vaccine allergy does occur, it can …