A cough that occurs continuously for a month. First of all, it is likely to be cough variant asthma, which is often an irritating dry cough, often at night or in the early morning, triggered by a cold or other reasons, and can be diagnosed by a bronchodilator test or a bronchial excitation test. Therefore, coughing may occur. Bronchodilators and glucocorticoids are often effective at this time, and direct inhalation of Cymbalta is recommended to relieve cough symptoms. Another cause of coughing may be a serious respiratory infection that persists, which can often be diagnosed with a CT scan of the chest. At this time, it is best to do sputum culture and drug sensitivity test, and choose appropriate antibiotics for anti-inflammatory treatment according to the sensitive drugs, which is more effective.