What are the common signs of anaphylaxis?

Anaphylaxis is a severe, life-threatening allergic reaction that occurs rapidly after exposure to an allergen. The correct answer outlines the most characteristic signs and symptoms of anaphylaxis.

Difficulty breathing is a critical symptom due to bronchoconstriction, which can lead to airway obstruction. Swelling of the face and throat, known as angioedema, further complicates breathing and can occur rapidly. A rapid pulse, or tachycardia, is a common physiological response as the body struggles to maintain blood pressure and circulation during this acute response. Hives, or urticaria, are skin manifestations that frequently arise during anaphylactic reactions, often as a result of histamine release.

Recognizing these signs is crucial for timely intervention, as anaphylaxis requires immediate medical attention, often necessitating the administration of epinephrine and supportive care. The other options include symptoms that are either more generalized, less severe, or associated with non-life-threatening conditions, making them unsuitable for the identification of anaphylaxis.