What are the common symptoms of an allergic reaction?

Step-by-step solution

By exposing or injecting a patient with very small doses of possible allergens, the cause of an allergy can be determined by studying the reactions. The common symptoms of an allergic reaction include sneezing, watery eyes, running nose, and difficulty in breathing .The exaggerated response of the immune system to certain antigens present in the environment is called allergy. The substances to which such an immune response is produced are called allergens. The symptoms of allergic reactions include sneezing, watery