Infants with sinusitis may cause coughing, which is a common cause of persistent cough in many infants in clinical practice, mainly for the following analysis: First, if infants have sinusitis, long-term nasal snot reflux, the refluxed snot chokes into the trachea and easily induces patients to develop an irritating dry cough, which is more common during the day and may be alleviated at night when lying down due to reduced reflux. Secondly, due to the long-term backflow of nasal mucus in infants, the mucus contains a large amount of bacteria, which easily breeds infection in the trachea and lungs, inducing patients to develop pneumonia and bronchitis, etc. With these diseases, patients will often cough and may develop a cough with phlegm. If parents find that their infant has a recurrent cough, along with sinusitis, they need to attend an ENT department as well as a pediatric respiratory unit for systematic treatment.