Children’s runny nose is mainly caused by inhalation of irritating gases, upper respiratory tract infection or allergic rhinitis, there is no fastest way, you can follow the doctor’s instructions according to the cause of the general treatment and drug treatment. 1. Inhalation of irritating gases: After inhaling irritating gases, children are prone to runny nose and sneezing, so you can stay away from irritating gases to relieve sneezing and runny nose. 2. Upper respiratory tract infections: children infected with bacteria or viruses and other pathogens that cause upper respiratory tract infections will have a runny nose, sneezing and other symptoms, you can use anti-inflammatory granules and other medications to alleviate the symptoms of a runny nose. 3. Allergic rhinitis: When children with allergies are exposed to allergens, they will experience symptoms of allergic rhinitis such as sneezing and runny nose, which can be relieved quickly by antihistamines such as cetirizine hydrochloride drops. Children’s runny nose may also be caused by other reasons, want to relieve the symptoms of runny nose, it is best to find the cause of the runny nose, timely medical treatment, treatment and treatment for the cause. The above medications should be used under medical supervision.