Department of Respiratory Medicine, Lu 'an Hospital of Traditional Chinese Medicine Zhang Wendong: 1. There are many reasons for chronic cough, which can usually be divided into two categories: one is that there are definite lesions on the initial X-ray chest film, such as pneumonia, tuberculosis, lung cancer and so on. The other is that there is no obvious abnormality in the chest X-ray film, and cough is the main or only symptom, that is, the so-called unexplained chronic cough (referred to as chronic cough). The common causes of chronic cough are cough variant asthma (cva), postnasal drip syndrome (pnds), eosinophilic bronchitis (E) and gastroesophageal reflux cough (gerc), accounting for 70%~95% of chronic cough in respiratory medicine outpatient department. Other causes are rare, but involve a wide range, such as chronic bronchitis, bronchiectasis and endobronchial tuberculosis. 2. Please further clarify the targeted treatment after diagnosis.