Mites are ubiquitous organisms that are invisible without the use of a microscope because of their small size; in fact, they can be found in a variety of natural conditions or human habitats. With the modernization of people’s living environment, the incidence of allergic diseases related to dust mites is rapidly increasing. Currently, the most notable mites in metaplasia (allergic) reactions are those that induce allergic reactions in humans in their living environment. These mites are mainly dust mites and storage mites. Specifically, dust mites include dust mites, house dust mites, and euryhaline dust mites; storage mites are mainly tropical clawless mites. Dust mites and allergic diseases 1. Dust mites and asthma (1) Epidemiological studies show that dust mites are a risk factor for the development of asthma in children and adults. (2) Regarding the effectiveness of dust mite allergen control in the prevention and treatment of asthma. Removal from the dust mite environment or reduction of dust mite allergen levels is definitely beneficial for patients with dust mite allergic asthma. (3) Immunotherapy for dust mite allergic asthma. 2. Dust mite allergy and allergic rhinitis Many studies have shown that dust mites are the most important allergens in allergic rhinitis. As one of the most important allergens in allergic rhinitis, dust mites can play a role in the development of nasal polyps by inducing inflammation of nasal mucosa for a long time. 3. Dust mites and atopic dermatitis The prevalence of atopic dermatitis (also known as genetic atopic dermatitis, atopic dermatitis) in children is 10%. Dust mites are one of the most important allergens in atopic dermatitis, and the degree of allergy to dust mites in patients is closely related to the severity of atopic dermatitis. Dust mites can cause atopic dermatitis in two ways: (1) directly through the skin; (2) through inhalation of dust mite allergens; many patients with atopic dermatitis often have other allergic symptoms, such as asthma or allergic rhinitis.