There is no best and fastest way to dispel phlegm and relieve cough, and the treatment should be targeted according to the cause of the disease, such as colds, bronchitis, chronic obstructive pulmonary disease, lung cancer and so on. 1. Cold and flu: you can carry out targeted cough and phlegm treatment, using fresh bamboo lee oral solution and other drugs to improve the symptoms in a timely manner. 2. Acute bronchitis: timely anti-infection such as penicillin, cefuroxime, combined with cough and phlegm relief such as dextromethorphan, ambroxol and other drugs. 3. Chronic obstructive pulmonary disease or chronic bronchitis: quit smoking, use expectorant drugs such as Ambroxol, acetylcysteine, etc. to dissolve mucous phlegm and assist coughing out. 4. Lung cancer: Combined with the staging, assess the timing and indications for surgery, radiotherapy and chemotherapy. The selection and use of specific drugs need to consult the doctor in time and follow the doctor’s instruction.