There are many causes of phlegm, such as infectious factors, non-infectious factors, etc. After a clear diagnosis, according to the cause of the disease to take targeted drug therapy, surgical treatment, etc., and if necessary, to be symptomatic treatment. 1. Infectious factors: Pneumonia, bronchitis, bronchitis, pharyngitis, bronchial dilatation and other diseases are respiratory tract infections, due to viral or bacterial invasion caused by phlegm. Bacterial infections require antibiotics, such as amoxicillin, as prescribed by the doctor, and viral infections can be improved by rest, and ribavirin can be taken. In addition, it is necessary to take medicines to dissolve phlegm, such as bromhexine and aminoglutethimide hydrochloride. 2. Non-infectious factors: non-infectious including tumor, cardiogenic, immune connective tissue diseases, etc., need to target the primary disease to be dealt with, and if necessary, to be symptomatic treatment. If sputum is caused by lung cancer, it should be treated with comprehensive treatment based on surgical treatment after clear diagnosis, and if necessary, it should be given medicines to dissolve sputum and stop cough, such as aminoglutethimide hydrochloride. There are many other causes of phlegm, such as gastroesophageal reflux disease, it is recommended that patients go to the hospital in time to improve the examination, clear diagnosis, and give targeted treatment, the above drugs need to follow the guidance of the application of the doctor, and should not be used indiscriminately, so as not to cause adverse consequences.