What is a severe allergic reaction known as?

A severe allergic reaction is recognized as anaphylaxis. This is a critical and potentially life-threatening response that can occur rapidly after exposure to an allergen, such as certain foods, insect stings, or medications. Anaphylaxis is characterized by a range of serious symptoms that may include difficulty breathing, swelling of the throat, a rapid drop in blood pressure, and hives, among other manifestations. Due to its severity, it requires immediate medical intervention, often including the administration of epinephrine.

The other terms provided refer to allergic reactions that are less severe. Mild and moderate allergic reactions typically involve less intense symptoms, such as localized swelling or itching, and do not require the urgent treatment that anaphylaxis does. Recognizing the signs of anaphylaxis is crucial for timely and effective treatment, which is why this term is specifically associated with severe allergic reactions.