A life-threatening reaction that can lead to a drop of blood pressure,loss of consciousness,and death if untreated.

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Anaphylaxis is a severe, life-threatening allergic reaction that can occur within seconds or minutes of exposure to a trigger, such as certain foods or insect venom. Symptoms can include difficulty breathing, swelling of the face or throat, rapid or weak pulse, nausea or vomiting, and fainting or loss of consciousness. Treatment with epinephrine (adrenaline) is necessary in order to prevent potentially fatal complications.

A Life-Threatening Reaction That Can Lead to a Drop of Blood