Patients with irritating dry cough symptoms may be caused by the following etiologies: 1. caused by environmental factors, such as excessively dry air, or patients inhaling irritating gases that irritate the throat and cause dry cough symptoms. 2. may be caused by patients suffering from acute and chronic pharyngitis, where the throat is congested and swollen, stimulating the nerves in the throat and causing dry cough symptoms. 3. Bacteria cause tracheobronchitis, and the tracheobronchial tubes are stimulated by the inflammation and the symptoms of irritating dry cough will appear. 4. Allergic factors cause the cough after contact with allergens, which is generally known clinically as cough variant asthma. There are more factors that can cause irritating dry cough, so patients should go to the hospital for further examination to find the cause and then treat the symptoms.