The cause of phlegm and cough needs to be clearly identified and treated in conjunction with the cause of the cough to be most effective. Common causes include colds, lung infections, chronic lung diseases, etc. Cough and phlegm, anti-infection, bronchodilator treatment. 1. Colds, the most common cause, are usually treated symptomatically, with cough and phlegm as the main principle of treatment, using dextromethorphan, ambroxol and other drugs. You can also drink more water to relieve discomfort in the throat area and dilute phlegm. 2. Lung infection, due to the damage of the mucous membrane of the trachea and bronchus, there may be an increase in secretion and cough. According to the results of sputum culture and other tests, antibiotics such as cephalosporins and quinolones such as levofloxacin should be taken for targeted control. At the same time, it can also be combined with Ambroxol for sputum treatment. 3. Chronic lung diseases, such as chronic obstructive pulmonary disease, bronchial asthma, bronchiectasis, etc., are prone to cough with more white sputum. It is recommended to give bronchodilator treatment such as formoterol, combined with cough suppressant drugs such as Pneumococcus, licorice oral solution, and phlegmolytic drugs such as acetylcysteine, carbocysteine, and so on in combination with the results of pulmonary function. The specific cause of the disease should be clarified after medical examination, and the drugs should be used according to the doctor’s instructions.