Common symptoms of allergic reactions include all except which of the following?

Severe headache is not typically classified as a common symptom of an allergic reaction. Allergic reactions usually trigger responses from the immune system that involve the skin, digestive system, or respiratory system. Common symptoms include rash or flushed skin, which indicates a skin response; tingling in the mouth, often associated with food allergies; and vomiting, which can occur when the body reacts negatively to ingested allergens. These symptoms can vary in severity and can manifest quickly after exposure to an allergen. Recognizing the distinction between typical allergic reactions and less common symptoms like severe headaches is important for effective food safety management, especially in environments such as Starbucks, where food allergies must be carefully monitored and managed.