Cough variant asthma, mostly without sputum, is a specific type of asthma with a predominantly chronic cough, or the only clinical manifestation, occurring mostly at night and in the early hours of the morning, with an irritating cough. Cough variant asthma is also a type of asthma, but it is less common or less typical. Some patients may be misdiagnosed as having bronchitis because they do not have the typical clinical signs and symptoms of asthma. Cough variant asthma is clinically considered to have the same pathophysiological changes as asthma, with chronic inflammation of the airway mucosa and airway hyperresponsiveness. Because the patient does not have asthma symptoms, the pulmonary function test cannot be done as a routine bronchodilator test, but a bronchial excitation test or an exercise test. This test cannot be done at the primary hospital, and must be done at an experienced higher level hospital with resuscitation measures. The treatment is the same as that for bronchial asthma, which also requires anti-inflammatory drugs for the bronchial mucosa, etc.