The fastest way to resolve phlegm is to treat the cause of the disease, along with nebulization and anti-infection. Common causes of phlegm are COPD (chronic obstructive pulmonary disease), bronchiectasis, and pneumonia. Nebulization generally refers to nebulization therapy, after patients inhale expectorant spray medication, it can make phlegm dilute, so as to discharge, which is conducive to the smoothness of the airway; different diseases use different purposes of nebulization therapy. 1. For COPD (Chronic Obstructive Pulmonary Disease), nebulization therapy can be carried out to control chronic inflammation of the airways, to play the role of cough, phlegm, asthma, antispasmodic. 2. Typical manifestations of bronchiectasis include recurrent coughing, coughing up sputum or coughing up thick purulent sputum, and it is treated with nebulization by inhaling hypertonic saline in the airway for a short period of time, or by inhaling mucus loosening agents such as acetylcysteine, which helps to dilute and expel the sputum. 3. For pneumonia, the fastest way to resolve sputum is mainly nebulization and anti-infection treatment. Nebulization can dilute the sputum, which is conducive to sputum discharge. Lung inflammation due to pathogenic microorganisms, physical and chemical factors, immune damage, allergies and drugs, to be used in conjunction with the use of other anti-infective drug therapy, such as cephalosporin antibiotics. In addition, the usual diet should also pay attention to, eat more light food, drink more water, how can moisten the respiratory tract, help to resolve phlegm. There may be other causes of phlegm, such as tuberculosis, lung tumors, left heart failure and other diseases, it is recommended to go to the hospital in a timely manner to find out the cause of coughing and give standardized treatment.