Coughing yellow sputum in the morning and not coughing during the day may be caused by acute upper respiratory tract infections, bronchitis, pharyngitis and other diseases, which need to be treated for the cause. 1. Acute upper respiratory tract infection: it is a common disease that can cause such symptoms, you can empirically use penicillin such as amoxicillin or cephalosporins such as cefixime and other antibiotics active anti-infective treatment, which can be effective in relieving the symptoms of yellow sputum in the morning cough. 2. Bronchitis: If the morning cough and yellow sputum symptoms caused by chronic bronchitis, you can use aminoglutethimide, bromhexine and other phlegm drugs, and at the same time, you can use levofloxacin and other antibiotics to actively anti-infective treatment. 3. pharyngitis: pharyngitis, such as bacterial infection, can appear morning cough yellow sputum symptoms, can use penicillin such as amoxicillin anti-infective treatment, and at the same time can use the compound borax gargle treatment. Coughing yellow phlegm in the morning and not coughing during the day can also be caused by other diseases, if the symptoms do not ease or aggravate, it is recommended to consult a doctor in time, according to the doctor’s instructions for standardized treatment.