Itchy throat after inhaling cold air is common in acute simple pharyngitis, reflux pharyngitis, chronic allergic pharyngitis and other diseases. Different causes are treated differently and should be treated promptly. 1. Acute simple pharyngitis: often occurs in the transition period between fall and winter or winter and spring, and can be triggered by cold air, such as dry and itchy throat. 2. Reflux pharyngitis: It can be seen in patients with gastroesophageal reflux, in which the stomach contents or gastric juice reflux and stimulate the pharynx, which can cause foreign body sensation or itching in the pharynx. 3. Chronic allergic pharyngitis: this disease often occurs due to allergic rhinitis attacks, spread down to the pharynx caused by coughing phlegm, throat itching and irritating cough and other symptoms. If the symptoms are not relieved, it is necessary to consult a doctor for a systematic examination to clarify the diagnosis and standardize the treatment under the guidance of the doctor.