Allergic rhinitis is a disease characterized by an allergic reaction to external substances. Since it involves allergies to external substances, it is necessary to identify what triggers the allergy, generally requiring an allergen test. Without testing the causes of allergies, the treatment is merely based on experience or a clinical diagnosis lacking in etiological understanding, which is insufficient from a pathological perspective. Moreover, after identifying the allergens, medication can be tailored according to the allergens, or general advice can be given to the patients, such as avoiding certain allergy-inducing substances. For instance, mangoes are commonly known to trigger allergies, and so are fish and seafood, thus specific guidance can be provided to avoid consuming certain foods.