Many parents or primary care physicians may think that allergic rhinitis is just sneezing and itchy nose. There is no need to use medication, check allergens, or even go to the hospital to adjust the medication. 1. worry about the side effects of medication, 2. it is a lot of trouble to follow up, 3. it is painful to draw blood, and the cost of allergen check is not low. But personally, I think that allergic diseases must be checked for allergens. There are 2 common ways to check allergens. 1. Skin prick test (SPT) is minimally invasive, fast, reproducible and highly sensitive. However, it is generally difficult for children under 4 years old to cooperate. 2, serum specific LgE test Specific, but high cost and slow results. Suitable for younger children, puncture can not cooperate. The diagnosis of allergic rhinitis can only be confirmed if the symptoms of allergic rhinitis are present and the allergens identified are related to the disease. The diagnosis of localized allergic rhinitis is now also available. Finding out what allergies are present and living prevention should also be the most important aspect of treatment. It also helps a lot to determine the season of onset, medication and treatment modality. Allergic rhinitis and bronchial asthma are: the same airway and the same disease. About 20% of allergic rhinitis patients are combined with asthma; 80% of asthma patients are combined with allergic rhinitis. Controlling rhinitis well is important to prevent asthma attacks. 1. In allergic rhinitis, the turbinates are enlarged, blocking the nasal cavity and open-mouth breathing. Allergens lose nasal blockage, humidification and heating. Directly into the airway, it will aggravate the airway inflammation. 2, nasopulmonary reflex, inflammation of the nasal cavity through the nasopulmonary reflex, causing bronchospasm. 3, Backflow of secretions from the nose, which enters the airway through the pharynx and irritates the trachea. 4, Inflammatory factors in the nose enter the blood and cause changes.