What are common signs of anaphylaxis?

Anaphylaxis is a severe, life-threatening allergic reaction that occurs rapidly after exposure to an allergen. One of the hallmark signs of anaphylaxis is difficulty breathing, which arises due to airway swelling, bronchoconstriction, or both. Concurrently, a skin rash may manifest in the form of hives, urticaria, or widespread redness, indicating a systemic allergic response.

The combination of skin rash and difficulty breathing is a classic presentation of anaphylaxis, highlighting the immediate need for medical intervention. The presence of both symptoms is indicative of the body's intense immune response, requiring urgent treatment with epinephrine to reverse the life-threatening aspects of the reaction.

Other symptoms such as nausea and vomiting, headache, and fever can occur in various medical conditions but are not central to the diagnosis of anaphylaxis, making them less relevant in this context. The critical nature of the respiratory distress combined with skin manifestations in option B underscores its significance as a presentation of anaphylaxis.