The itchy throat of colds is considered to be caused by viral stimulation of the mucous membrane of the throat, the induction of chronic pharyngitis, and postnasal drip. 1. Virus stimulation of the mucous membrane of the throat: after the upper respiratory tract infection, the virus invades and stimulates the mucous membrane of the respiratory tract, making the mucous membrane of the throat congested and edematous, which shows the phenomenon of sore and itchy throat. 2. Chronic laryngitis: After a cold, the body’s resistance decreases, bacteria, viruses and other pathogens are prone to invade the body, stimulate the mucous membrane of the pharynx, chronic inflammation occurs. Clinically, it is characterized by dry throat, sore throat, and foreign body in the throat. 3. Postnasal drip: refers to the occurrence of rhinitis or sinusitis caused by patients with colds, in this case, the nasal secretion increases, backflow to the pharynx, stimulate the mucous membrane of the pharynx, causing itchy throat performance. Therefore, the itchy throat after a cold, it is recommended to go to the hospital in time, after the cause of the disease is clear and active treatment.