The symptoms of phlegm in the late stage of cold and flu can be improved through rational use of medication and daily life management, but if the symptoms do not improve, we should be alert to the existence of complications. 1. Reasonable use of medication: People who have excessive phlegm in the late stage of cold and flu can, under the guidance of a physician, take some medicines that have the function of expectorant and phlegm, such as Ambroxol, Bromhexine, etc., or use some proprietary Chinese medicines to carry out symptomatic treatment, such as Tangerine Red Phlegm Coughing Liquid. If there are symptoms such as coughing up yellow phlegm, antibiotics such as cefradine can be taken for treatment. 2. Daily life management: cold patients in the emergence of phlegm symptoms, but also need to do a good job of daily care to assist in the treatment, such as drinking warm water, light diet, maintain oral hygiene, etc., in order to improve the disease caused by phlegm symptoms. If the phlegm symptoms worsen in the late stage of cold and flu or are accompanied by new symptoms, it is necessary to be alert to viral pneumonia and other complications, and it is recommended to consult a doctor in time, complete the examination and follow the doctor’s instructions.