Intractable cough refers to chronic cough of undiagnosed etiology and poor therapeutic efficacy, and recurrent episodes of more than one month without cure, the clinical treatment is quite tricky, the etiology of intractable cough includes: 1, common etiology: the main cough variant asthma, upper airway cough syndrome, gastroesophageal reflux cough, eosinophilic bronchitis, allergic cough, etc.; 2, rare etiology: sleep apnea syndrome, cerumen in the external auditory canal and so on may also cause intractable cough.