There is no such thing as the most feared nemesis of cough. There are many diseases that cause cough, such as respiratory tract infection, bronchial asthma and lung cancer, etc., which need to be given medication and surgical treatment according to the cause under the guidance of doctors. 1. Respiratory tract infection: cough is the most common symptom of respiratory tract infection, if it is acute upper respiratory tract infection, mostly related to viral infection, you can use symptomatic cough medication such as compound licorice; if it is a lung infection, you need to use antibiotics according to the type of pathogens and follow the doctor’s instructions, such as ceftazidime, azithromycin and so on. 2. Bronchial asthma: bronchial asthma is characterized by chronic airway inflammation and airway hyperresponsiveness, treatment can be nebulized inhalation glucocorticosteroid such as budesonide, or oral montelukast sodium tablets for treatment. 3. Lung cancer: cough is the most common symptom of lung cancer, which should be treated according to the patient’s condition, tumor cytology, invasion and scope, etc., and be given comprehensive treatment mainly based on surgery. Cough is also seen in cardiac insufficiency, tuberculosis, etc. It is necessary to go to the hospital in time to find out the cause and treat it under the guidance of doctor.