Does your child have a frequent cough? Does your child have a cough that lasts more than 4 weeks and is worse at night and in the morning, with a runny nose, something running down his or her throat and the need to clear his or her throat frequently? Is your child suffering from asthma and the asthma medicine alone is not effective? If you answered “yes” to the above questions, it’s time to take your child to have his or her nose looked at, because a runny nose is a common cause of cough in children aged 1-6 years. A runny nose causes a cough because nasal mucus or nasopharyngeal secretions stimulate the cough reflex in the throat, and nasal congestion causes open-mouth breathing, which can lead to pharyngitis. In pediatric patients, the above symptoms are mainly seen in various types of rhinitis, sinusitis, adenoidal hypertrophy and tonsillitis. When the above occurs, the only way to finally relieve chronic cough symptoms is to seek prompt medical attention, perform an electronic nasopharyngoscopy if necessary, and give targeted treatment to remove the nasal etiology.