Which of the following are signs and symptoms of anaphylaxis?

The signs and symptoms of anaphylaxis commonly encompass a rapidly progressing sequence of reactions that can be life-threatening. Difficulty breathing and low blood pressure are particularly noteworthy manifestations of this severe allergic reaction.

Difficulty breathing can occur due to swelling of the airways or constriction of bronchial passages, leading to wheezing or shortness of breath. This is a critical sign indicating that airflow is compromised, which requires immediate intervention. Low blood pressure, often a result of vasodilation and the pooling of blood, may lead to shock, making it indispensable to identify and treat promptly.

While hives, fatigue, swelling, dizziness, elevated heart rate, and confusion are all potential signs associated with allergic reactions, they do not specifically encapsulate the life-threatening nature of anaphylaxis in the same sense that difficulty breathing and low blood pressure do. These latter symptoms indicate a more severe progression of the allergic reaction, necessitating urgent medical attention.