The appearance of dry cough for a month, this situation needs to consider the cause of timely treatment, you need to go to the hospital for lung CT and pulmonary function and other tests to clarify the cause of the disease. Clinically, it is more commonly caused by non-infectious factors of the respiratory system, such as cough variant asthma, which is caused by a special type of bronchial asthma. Allergens should be detected, blood tests and lung function should be checked to determine the cause and condition. Anti-allergic drugs can be given, such as paracetamol, loratadine, cetirizine, ketotifen, montelukast, etc. can be chosen. Cough suppressants and asthma relievers, such as cotrimoxazole capsules, can also be given. At this time, you can also choose the nebulized inhalation treatment, which can relax the spasm of the bronchial smooth muscle and dilate the airway. For example, choose albuterol nebulizer, terbutaline nebulizer, ipratropium bromide nebulizer. Oral or inhaled glucocorticoid therapy may also be given for severe cases. If there is a combination of bacterial infection, antibiotics can be used appropriately, such as choosing clindamycin, levofloxacin and other drugs.