Postnasal drip syndrome is a syndrome in which the cough is the main manifestation due to the backflow of secretions into the nasopharynx and pharynx, or even the trachea, caused by nasal diseases. The typical clinical manifestations of postnasal drip syndrome are: 1. paroxysmal or persistent cough, mainly during the daytime, more pronounced in the morning. 2. 2. Most patients have a backflow of nasal secretions, itching in the pharynx, foreign body sensation or a feeling of mucus attachment to the posterior pharyngeal wall, and frequent throat clearing. 3.Some patients have hoarseness, and even speaking can induce coughing. 4.There are symptoms such as nasal itching, nasal congestion, runny nose and sneezing. 5.History of rhinitis, sinusitis, allergic rhinitis, nasal polyps or chronic laryngitis. However, a considerable number of patients do not have obvious nasal symptoms such as nasal congestion and runny nose, but only show pharyngeal discomfort and chronic cough. Although they have been seen for a long time but lack knowledge of postnasal drip syndrome, they only pay attention to the manifestations of tonsils, pharynx and lungs without performing specialized otorhinolaryngological examination and ignore the relevant medical history and other signs, which often lead to misdiagnosis and omission. Cough is a common clinical condition, and postnasal drip syndrome is one of the most common causes of chronic cough in adults and a more common cause of chronic cough in children, with the highest incidence of postnasal drip syndrome in children under 10 years of age. The incidence of postnasal drip syndrome is highest in children under the age of 10 years, as recurrent tonsillitis and adenoid hypertrophy in this age group block the nasopharynx and affect the normal drainage of nasal secretions, resulting in the development of postnasal drip syndrome and rhinitis and sinusitis. The underlying diseases that cause postnasal drip syndrome include rhinitis, sinusitis, allergic rhinitis, nasal polyps, and pediatric adenoid hypertrophy. The swelling of nasal mucosa, turbinate hypertrophy and retention of secretions can lead to nasal congestion, forcing patients to change from mainly nasal breathing to mainly oral breathing, and the change in breathing pattern allows allergens to avoid the nasal mucosal barrier and enter the lower respiratory tract directly; in addition, nasal inflammatory secretions can also flow into the airway unconsciously when sleeping in the supine position and cause coughing and wheezing. Therefore, patients with chronic and recurrent cough should go to the ENT department for specialist examination to avoid delaying the condition. The etiology of postnasal drip syndrome is complex, and systematic and standardized conservative treatment is necessary and preferred, firstly, treatment for the etiology: such as targeted treatment for primary diseases such as nasal polyps, acute and chronic rhinitis, sinusitis, allergic rhinitis, etc., application of anti-allergic and anti-inflammatory drugs as well as application of traditional Chinese medicine according to evidence to reduce inflammatory reactions and secretions; secondly, symptomatic treatment, local drops, spray nasal spray or local nebulization. At the same time, postnasal drip can also be reduced by promoting the recovery of mucosal function and promoting the discharge of nasal secretions. In addition, attention should be paid to dietary contraindications, posture during sleep, etc., and combined with a combination of therapies such as immunotherapy. We generally use a combination of Chinese and Western medicine, internal and external treatment methods to treat, Chinese medicine is particularly important to participate in the treatment, can often receive twice the effect with half the effort. For patients who are prone to cold and are triggered by climate change, and whose symptoms are identified as qi deficiency, the treatment should be to benefit qi and consolidate the surface, and harmonize Ying and Wei, and can be combined with Chinese medicine acupuncture point paste; if the coughing phlegm is thin and abundant, the treatment should be to dry dampness and dissolve phlegm; if the flow of yellow and thick mucus is obvious, the treatment should be to clear heat and dampness, and dissolve phlegm and open the orifice; however, if the effect of conservative treatment is not good, timely surgery is also necessary for those who have indications for surgery. The prevention and treatment of postnasal drip syndrome should start with the prevention of rhinitis and sinusitis at the source, such as allergic people or those suffering from chronic rhinitis, sinusitis, nasal polyps, etc. are more likely to suffer from this disease, especially when the weather changes, the symptoms are more obvious and more serious; if suffering from acute inflammation, timely treatment is necessary to prevent its transformation into chronic; if some children have perennial runny nose, nasal congestion, sneezing or have frequent snoring at night, especially parents should be concerned about the symptoms. If some children have perennial runny nose, nasal congestion, sneezing or frequent snoring at night, they should especially attract the attention of parents.