What is allergic disease: Allergic disease, also called allergic reactive disease, is by far the most common type of chronic disease. It manifests itself as an excessive immune response to one or more substances in the environment, and leads to damage to tissues and organs, never affecting normal physiological functions. The substances that induce allergic reactions are called allergens. Inhaled allergens are allergens that float in the air and enter the body with breathing, and common inhaled allergens include dust mites, pollen, fungi, animal fur, feathers, cotton wool, etc. Among the inhalant allergens, dust mites are one of the most widely distributed allergens in the world, suitable for living in a warm and humid environment and growing in the spring and autumn. They are mainly found in bedrooms, especially in mattresses, sofas, carpets, clothing and air conditioning filters. Early standardized desensitization of patients with confirmed dust mite allergy can lead to satisfactory results. Sublingual desensitization is a new treatment for allergic diseases advocated by the World Health Organization in recent years. It allows the patient to start with a low dose of sublingual desensitizing agent and gradually increase the dose to a maintenance dose for a sufficient duration to regulate the body’s immune system to develop tolerance to the allergen, so that the patient no longer has allergic symptoms or the allergic symptoms are significantly reduced when exposed to the allergen again.