Long-term paroxysmal severe dry cough is most commonly seen in cough variant asthma, allergic pharyngitis, chronic bronchitis and so on. 1. Cough variant asthma: a form of asthma, the specific cause is not clear, but generally believed to be similar to the typical causes of asthma, and environmental factors and genetic factors, etc., may be due to inhalation of cold air, contact with irritating odors and other triggers, the only or main symptom is a cough, and most of them are dry cough. 2. Allergic pharyngitis: it may be triggered by environmental factors, smoking or poor dietary habits, often leading to a continuous irritating dry cough, and accompanied by a foreign body sensation in the throat. 3. Chronic bronchitis: may be related to infection, environment, climate and other factors, the patient may simply have a dry cough, may also be accompanied by a small amount of sputum. Long-term paroxysmal severe dry cough may also be gastroesophageal reflux stimulation of cough, lung tumors, interstitial lung fibrosis and other diseases caused by patients are advised to go to the hospital in a timely manner to find out the cause of the active cooperation with the doctor to avoid recurrence or aggravation of the condition.