Allergic diseases are common. With the control of infectious diseases and increased industrialization, the incidence of allergic diseases has been increasing year by year worldwide and has become a global health issue of great concern to governments. The World Allergy Organization (WAO) released the results of an epidemiological survey of allergic diseases in 30 countries on the World’s First Allergy Day: of the total population of 1.2 billion people in these countries, 22% (250 million people) suffered from IgE-mediated allergic diseases, including allergic rhinitis, asthma, conjunctivitis, eczema, food allergy, medication allergy, and severe allergic reactions, among others. In Western countries, the prevalence of allergic rhinitis and asthma has increased rapidly over the last 40 years. Epidemiologic surveys of allergic diseases in the general population in Europe began at the beginning of the last century, and their prevalence was below 1% in the 1920s, began to rise after the Industrial Revolution, and gradually increased from the 1950s to the 1980s, with a dramatic rise after the 1980s. According to the World Health Organization (WHO), it is estimated that about 150 million people worldwide suffer from asthma, with more than 50% of adults and at least 80% of children suffering from asthma triggered by allergic factors, and more than 180,000 deaths due to asthma each year. The prevalence of food allergies, eczema and drug allergies has also increased significantly in recent years. In the United States, 3 million people are allergic to peanuts and nuts, and the prevalence of food allergy is 4% in children under 6 years of age and 1% to 2% in adults. Food allergy has become a major cause of severe allergic reactions and anaphylaxis. Atopic dermatitis is common in infants and children in Europe, the United States and developed Asia-Pacific regions, and its incidence has risen from 3% in the 1960s to 10% in the 1990s. Drug allergy accounts for 10% of all adverse drug reactions in the United States, and penicillin is the most common cause of sensitization, with 400 deaths per year due to penicillin anaphylaxis. The rapid increase in the prevalence of allergic diseases has reached epidemic proportions. The increase in these diseases is associated with long-term, persistent environmental factors and lifestyle changes. Western scholars have found that the incidence of allergic diseases is higher in developed than in developing countries, higher in urban than in rural areas, and higher in polluted than in non-polluted areas; in developing countries, the increase in allergic diseases is associated with the adoption of an urbanized, “Western” lifestyle, where children of farmers are less likely to suffer from allergic diseases than other children; and in cities, the increase in the number of children of parents who are highly paid or professionals is associated with the adoption of an urbanized, “Western” lifestyle. In developing countries, the increase in allergic diseases is associated with the adoption of an urbanized “Western” lifestyle, where children of farmers are less likely to suffer from allergic diseases than other children; and in cities, where children of high-paying or professional parents are more likely to suffer from allergic diseases than children of low-paying parents. Allergic diseases are chronic, and the direct and indirect costs of the diseases have serious implications for patients and their families, for the health system and for society as a whole. The unprecedented prevalence of allergic diseases places an enormous financial burden and strain on health resources in many countries. Global costs associated with allergic rhinitis, including medications, counseling, and time off from work, have exceeded$20 billion annually. Global expenditure on antiallergic drugs alone has exceeded$8 billion. Therefore, we need to recognize allergic diseases and treat them correctly; early detection, early diagnosis and early treatment.