Postnasal drip syndrome cough in children can be caused by rhinitis, sinusitis and allergic rhinitis. It can be treated with glucocorticoids, antibiotics and antihistamines under the guidance and advice of a doctor, and sinusitis can also be treated with surgery. 1. Rhinitis: due to chronic inflammation of the nasal mucosa, resulting in increased secretions, which, especially in the posterior part of the nasal cavity, causes secretions to flow backwards into the nasopharynx. This leads to the phenomenon of coughing in children with postnasal drip syndrome, patients can take methylprednisolone tablets under the guidance of the doctor for treatment. 2. Sinusitis: Nasal secretions from the sinuses caused by chronic inflammation, backward into the nasopharynx. It is easy for secretions to flow backward. Patients can take cefadroxil and other treatment under the guidance of the doctor, and if necessary, need to be treated by endoscopic sinus surgery. 3. Allergic rhinitis: the mucous membrane in the nasal cavity is edematous and the inferior turbinate is enlarged, blocking the nasal respiratory tract, causing the backflow of snot due to the blockage of the front of the nose, leading to coughing, and can be treated by taking levosulpiride under the guidance of a doctor. When a child has a postnasal drip syndrome cough, go to the hospital in time for consultation, to clarify the cause of the disease and actively cooperate with the doctor’s treatment, and under the guidance of the doctor’s advice on the use of medication, so as not to cause adverse effects.