Common causes of itchy dry cough include allergic pharyngitis, reflux pharyngitis and infectious pharyngitis. 1. Allergic pharyngitis: When you eat allergic foods, such as seafood, egg yolks and nuts, or breathe in allergens such as dust, pollen and animal dander, the mucous membrane of the throat produces an allergic reaction and releases histamine, which can stimulate the throat to itch and dry cough and other symptoms. 2. Reflux pharyngitis: when stomach contents mixed with stomach acid reflux into the throat above the esophageal sphincter, the reflux material will stimulate the mucous membrane of the throat to cause reflux pharyngitis, and the patients often have abnormal manifestations such as blockage of the throat, itching and frequent dry cough. 3. Infectious pharyngitis: If the throat is infected by bacteria, viruses and other pathogenic microorganisms, it will cause infectious pharyngitis. Under the stimulation of inflammatory factors, the mucous membrane of the throat and the smooth muscle of the throat will appear itching and dry cough. Patients with itchy dry cough should consult a doctor in time to find out the cause and then actively cooperate with the doctor’s treatment.