Itchy dry throat and cough after a cold may be caused by cold symptoms or post-infectious cough. 1. Cold symptoms: Virus-induced inflammatory mediators leading to the upper respiratory tract afferent nerve hypersensitivity state can lead to a cold with symptoms of a scratchy throat and dry cough. It is generally self-limiting, resolves in 5-7 days, and does not require treatment. If the symptoms are serious, such as dry cough, give dextromethorphan cough treatment, dry throat, give watermelon cream tablets to moisturize the throat treatment. 2. Cough after infection: persistent cough is related to the damage of airway mucosa caused by viral infection, exposure of sensory nerves, airway inflammation has not healed, in addition, viral infection leads to airway hyperreactivity is also the main factor of itchy throat and dry cough after a cold. It usually lasts for 3-8 weeks. Symptomatic treatment is usually given, such as dextromethorphan for cough suppression and loratadine for anti-allergy treatment. Itchy throat and dry cough can also be caused by other diseases, if the symptoms are more serious or persistent, it is recommended to consult a doctor in time, complete the relevant examinations to determine the cause of the disease, and follow the doctor’s instructions for treatment.