The light green sputum in the throat of a cold is mainly related to the bacterial infection secondary to the cold, and the treatment is mainly based on active anti-infection treatment. Colds are mainly caused by viral infections, the symptoms are mainly manifested in nasal congestion, runny nose, coughing, coughing up phlegm and so on. Cough and sputum caused by viral infections are mainly white foamy or thick sputum. If light green sputum is present, secondary bacterial infections, commonly Pseudomonas aeruginosa, are considered, and the treatment is cefixime, moxifloxacin and other anti-infective, while aminoglutethimide is given to reduce sputum and other symptomatic treatments. In addition, nasal diseases, such as sinusitis, can be caused by excessive nasal secretions, resulting in the backflow of light green nasal mucus to the oropharynx, causing spitting light green sputum. Treatment is mainly amoxicillin, cefixime and other antibiotics to fight infection, if necessary, can be given to the sinus puncture drainage to improve the symptoms. Light green phlegm in the throat can be caused by a variety of diseases, if the symptoms are not relieved or aggravated, it is recommended to consult a doctor in a timely manner, improve the examination, to clarify the cause of the disease, standardized treatment under the guidance of the doctor, so as to avoid delay in the condition.