According to statistics, 22% of the world’s population currently suffers from allergic diseases. Common allergic diseases include allergic rhinitis, allergic asthma, allergic skin disease, allergic conjunctivitis, etc. Due to air pollution and other factors, the number of allergic rhinitis patients in China has reached 20 million. What is allergic rhinitis? Allergic rhinitis is caused by the body’s allergy to a certain substance. It has two major causes, of which allergy is the internal cause and allergen is the external cause, and only when both are present will it lead to allergic rhinitis. When an allergic person is exposed to an allergen for the first time, the body will produce the appropriate antibodies. In the second exposure to the same allergen, the body will react with antigenic antibodies and produce various inflammatory mediators, which will stimulate the mucous membrane of the nasal cavity and cause symptoms such as nasal congestion, nasal itching, sneezing and runny nose. In severe cases, symptoms such as itchy eyes, loss of smell and headache may also occur. There are two types of allergic rhinitis: one is seasonal allergic rhinitis, which is fixed every year and is mostly related to the seasonal outdoor environment, such as plant pollen; the other is perennial allergic rhinitis, which has no obvious seasonal differences and is mostly related to the indoor environment, such as dust, mites, special odors, etc. The dangers of allergic rhinitis Spring is a painful season for many allergic rhinitis patients, repeated sneezing, runny nose, nasal congestion, hate not to want their nose. Although it is not a major disease, the headache, nasal congestion and sneezing it brings seriously affects the patient’s work, study, sleep and recreation, leading to a decrease in quality of life and affecting self-image in public places. More than half of allergic children are prone to sleep disorders, snoring, dental development disorders, and even cognitive impairments such as slow thinking, depression, and fatigue. Allergic rhinitis in its early stages, if left untreated, will triple the risk of developing asthma in the future, especially in children. A recent survey data shows that about 90% of children with asthma also have allergic rhinitis, compared to about 15% of the general population. In fact, the two are inextricably linked, although the clinical manifestations of the symptoms are different. Some allergic rhinitis, although there is no obvious asthma attack, but only nasal itching, nasal congestion, runny nose, sneezing or with incurable cough, or with chest congestion attacks, is actually a manifestation of increased bronchial reactivity, which is an atypical asthma attack. And with aggressive treatment of asthma, all these symptoms can be quickly relieved. Allergic rhinitis must be treated systematically with allergic asthma In the past, it was thought that allergic rhinitis was an upper respiratory tract disease and asthma was a lower respiratory tract disease, and that the two were completely separate diseases, but in recent years, more and more studies have found that the human airway is a whole from top to bottom, and that both anatomy and the mechanism of inflammation have confirmed that allergic rhinitis and asthma have common features, and that both are related to genetic constitution. In order to cure the lower airway, the upper airway must be controlled first. If allergic rhinitis is not well controlled, asthma will not be easily controlled. Therefore, allergic rhinitis and asthma must be treated together. We can understand that allergic rhinitis and allergic asthma are actually allergic reactions occurring in different parts of the body, either in the upper and lower airways or from the lower to the upper airways or vice versa, in a continuous process. Asthma can be completely avoided if effective preventive and therapeutic measures are taken for allergic rhinitis in the early stage of its onset. Many clinical data show that specific immunotherapy against allergens is the only effective preventive and therapeutic method against the cause of the disease. The key is to use internationally standardized antigens and inject them in a regular hospital, and if combined with local medication, it is more effective in reducing airway hyperreactivity, antagonizing allergic inflammation, controlling rhinitis, and preventing asthma attacks. In conclusion, it is an indisputable fact that allergic rhinitis and asthma are closely related and it should be considered as identical twins, being the same airway allergic inflammatory disease. This is the new concept of overall airway disease, and recognizing this is of great significance for the prevention and treatment of airway allergic diseases.