Common causes of yellow sputum include acute trachea-bronchitis, bronchiectasis and chronic bronchitis, which need to be treated. 1. Acute trachea-bronchitis: dry cough or a small amount of mucous sputum at the beginning, followed by an increase in the amount of sputum and worsening of the cough. If there is a bacterial infection, yellow sputum may appear. New macrolides such as clarithromycin or penicillins such as amoxicillin can be preferred for anti-infection treatment, and sputum chemotherapy such as aminoglutethimide can be given if necessary. 2. Bronchiectasis: manifested by persistent or recurrent cough, sputum or coughing up pus sputum. Acute exacerbation should be routinely sent to the sputum culture before the start of antimicrobial therapy, according to the results of sputum culture and drug sensitivity to guide the application of antibiotics, at the same time, can be used empirically ceftriaxone sodium, cefotaxime, moxifloxacin and other drugs, at the same time, can be nebulized inhalation of acetylcysteine, such as sputum treatment. 3. Chronic bronchitis: the main symptoms are cough, cough sputum or with wheezing. Acute exacerbation, can be empirically given levofloxacin, amoxicillin, cefuroxime and other drugs, if the culture of the causative organisms, according to the sensitivity test selection of antibiotics. At the same time, you can use compound licorice combination, compound ammonium chloride combination, etc. to stop coughing and resolve phlegm. There are many other diseases that cause yellow phlegm cough, if the symptoms do not improve or aggravate, it is recommended that the patient consult a doctor in a timely manner to identify the cause of the disease and standardize the treatment under the guidance of the doctor.