There are many causes of frequent dry cough, inflammatory infections, allergic stimuli, such as chronic pharyngitis, reflux esophagitis, allergic cough and interstitial lung disease. 1.Chronic pharyngitis:Acute pharyngitis repeated episodes without cure, or chronic inflammatory infections of the upper respiratory tract can lead to chronic pharyngitis, there will be a pharyngeal foreign body sensation, causing patients with dry cough. 2. Reflux esophagitis: gastric acid reflux stimulation of the pharynx causes a dry cough. 3. Allergic cough: the patient’s respiratory sensitivity increases, contact with allergens such as cold air stimulation, dust pollen stimulation can cause allergies, stimulate the airway to produce an inflammatory response, stimulating the patient dry cough. 4. Interstitial Lung Disease: The most typical symptom of this disease is irritating dry cough, in addition to active dyspnea, progressive aggravation. Patients often dry cough can also be seen in other causes, such as mycoplasma infection, lung tumors, etc., should go to the hospital in a timely manner, according to the relevant examination, to determine the cause of the disease and then make a treatment plan.