There is no fastest way to treat a child’s runny nose. Common causes of runny nose in children are: physiological factors, upper respiratory tract infections, rhinitis and so on. It is recommended to go to the hospital in time to clarify the cause of the disease for targeted treatment. 1. Physiological factors: due to the richness of blood vessels in the nasal cavity of children, the nervous system function is not sound, so there will be a runny nose. Or due to the nasal mucosa because of cold stimulation, resulting in runny nose and so on. Generally do not need special medication to deal with, strengthen the daily care can be, such as pay attention to warmth, avoid cold and so on. 2. Upper respiratory tract infection: often manifested as sneezing, nasal congestion, runny nose, sore throat, cough and so on. Can follow the doctor’s instructions to take pediatric aminophenol xuanamin granules and other drugs to treat. 3. Allergic rhinitis: usually accompanied by sneezing, runny nose, nasal congestion, itchy nose and other symptoms. Saline rinse nasal cavity or nasal glucocorticoids, antihistamines, nasal decongestants and other drugs can be used. Children with runny noses are advised to go to the hospital in time to clarify the cause of the disease and treat the cause. If you need to use drugs, you need to use under the guidance of a doctor.