Cough and phlegm with cold are considered to be caused by viral or bacterial invasion of the respiratory tract, irritation of the respiratory tract, and increased glandular secretions, causing increased phlegm. You should use cough medicine along with cold medicine to relieve cough and expectorant, such as Ambroxol Hydrochloride, Chuanbei Loquat Paste, Lung Ning Granules, Compound Licorice Oral Liquid, etc. Be sure to drink more water, drinking water can dilute phlegm and promote phlegm discharge. During the treatment period, try not to smoke or drink alcohol, eat more vegetables and fruits, go out less and do not go to crowded places. After recovering from a cold, you should do physical exercise regularly to strengthen your body and improve its ability to resist diseases, and add clothes in time when the seasons change to prevent getting cold.