Diagnostic points for upper airway cough syndrome include: 1. The cough is prolonged and usually lasts more than 4 weeks; 2. It is usually heavy in the morning and evening, and children will have nasal manifestations with nasal congestion, runny nose, sneezing, foreign body sensation in the pharynx, and the cough sound is a clear throat-like cough; 3. On examination, we can see that children have pale nasal mucosa, hypertrophied turbinates, and possible nasal secretions; 4. If we observe the posterior pharyngeal wall. Some children can be observed to have nasal regurgitation in the posterior pharyngeal wall, and some have follicular hyperplasia in the posterior pharyngeal wall, but it is not 100% present. Some data show that 30% of children can be found to have follicular hyperplasia of the posterior pharyngeal wall, i.e., in the case of postnasal drip syndrome. Such children usually have lung auscultation on lung radiographs and blood tests, and it is likely that the cause will not be found, and the presence of allergies may be detected by allergen testing.