Coughing with phlegm after a cold may be caused by the disease not being effectively controlled or the immunity of the body being low, causing cross-infection and aggravation of the disease. Western medicine can give antibiotic drugs, antiviral drugs, cough and phlegm, and other drugs for symptomatic treatment. If there are symptoms of high fever, you can give ibuprofen or acetaminophen antipyretic treatment. If the cough is caused by wind-cold, you can use cough suppressant plus reduction, which is mainly used for coughs that persist or recur. If the cough is caused by wind-heat, we can use Sang Ju Drink plus or minus. If the cough is caused by low immunity, you can take Yu Ping Feng San granules for a long time, which can improve the body’s resistance.