Coughing with excessive phlegm may be caused by pharyngitis, lung infection, chronic lung disease, smoking or environmental stimulation, etc. According to different causes, local treatment, anti-infection, phlegm, smoking cessation or detoxification from the environment will be carried out to treat the causes. 1. Pharyngitis: it is a common disease that can cause excessive phlegm, and is usually treated locally by gargling with compound boric acid solution. 2. Lung infection: due to the stimulation of trachea and bronchial mucosa caused by sputum more, need to use penicillin and other anti-infective treatment. 3. Chronic lung diseases: such as chronic bronchitis, chronic obstructive pulmonary disease, etc., can be treated with drugs such as Ambroxol to dissolve sputum. 4. Smoking or environmental stimuli: Quit smoking and detach from the environment are the main treatment means. The specific cause of the disease needs to be clarified after medical examination, and at the same time, medication should be administered according to the doctor’s instructions.