Which of the following is NOT a common symptom of allergic reactions?

High blood pressure is not considered a common symptom of allergic reactions. Allergic reactions typically trigger symptoms that involve the immune response to allergens, leading to various physiological changes. Common symptoms include abdominal cramps, dizziness, and in severe cases, anaphylactic shock, which is a life-threatening reaction that can include difficulty breathing, swelling, and a sudden drop in blood pressure.

Abdominal cramps can occur due to gastrointestinal reactions, while dizziness may arise from blood vessel dilation or a drop in blood pressure during an allergic reaction. Anaphylactic shock is the most severe manifestation of an allergic reaction and emphasizes the urgency of recognizing and treating allergies promptly. In contrast, high blood pressure is usually not linked directly to allergic responses and is more often associated with other health conditions or stress responses.