Itchy dry throat cough may be caused by environmental factors, chronic pharyngitis, allergic pharyngitis and so on. 1. Dry pharyngitis: may be due to the air is cold, dry, some seasons wind speed, easy to cause ciliated epithelial degenerative changes, cilia motor dysfunction, mucus carpet movement is affected, mucus viscous, harmful substances in the air can not get rid of in time, which led to secondary infections, the symptoms of the throat itchy dry cough. 2. Chronic pharyngitis: repeated episodes of acute pharyngitis, a variety of nasal diseases and chronic inflammation of the respiratory tract, long-term open-mouth breathing and inflammatory secretions repeatedly stimulate the pharynx, or chronic tonsillitis, periodontitis, eating stimulating food or alcohol abuse can lead to the occurrence of congestion and edema of the throat area, resulting in chronic pharyngitis delayed, there can be itchy throat, dry cough and other symptoms. 3. Allergic pharyngitis: may be caused by contact with allergens, such as pollen, dust mites, and so on, resulting in irritating dry cough. Itchy throat and dry cough may also be caused by gastroesophageal reflux, etc. If the symptoms continue to be unrelieved, you need to go to the hospital in time.