A long drawn-out sound when coughing is common in various lung diseases and usually occurs in patients with airway hyperresponsiveness or respiratory tract infections. 1. Patients with airway hyperresponsiveness: Bronchial smooth muscle spasm, bronchoconstriction and stenosis may occur, producing a blowing airbox sound when airflow passes through the narrowed airways, such as in patients with bronchial asthma. 2. Respiratory tract infections: increased secretions in the respiratory tract, it is not easy to cough up, there will also be the sound of blowing a bellows, such as pneumonia, COPD acute exacerbation patients. Coughing long sound may also be caused by other reasons, coughing long sound is recommended to go to the regular hospital, ask the doctor to do further diagnosis, under the guidance of the doctor to do the appropriate treatment.