What symptom can indicate a customer is having an allergic reaction?

Wheezing or shortness of breath is a significant symptom that can indicate an allergic reaction, particularly in the context of food allergies. This respiratory distress reflects a serious response in the body to an allergen, which can involve the tightening of airways and difficulty in breathing.

Allergic reactions can trigger the release of histamines and other chemicals in the body, leading to inflammation and narrowing of the airways. This is particularly concerning, as it can escalate quickly and require immediate medical attention. Recognizing this symptom is crucial for ensuring the safety and well-being of customers who may be experiencing an allergic reaction.

While symptoms such as headache, rash, and dizziness can be associated with various conditions, they are not as directly indicative of an allergic reaction, particularly in a food service environment where immediate and specific responses are necessary to ensure customer safety.