Rough breath sounds are abnormal breath sounds caused by mild edema or inflammatory infiltration of the bronchial mucosa resulting in an unsmooth or narrowed wall, resulting in poor airflow entry. It is seen in the early stage of bronchial and pulmonary inflammation. Diagnosis: Early signs are mostly without any abnormal signs, or scattered dry or wet rales can be heard at the bottom of the lungs, and the rales may disappear after coughing and sputum discharge, and the number of rales in the lungs may increase during acute attacks, depending on the condition. In patients with chronic bronchitis combined with asthma, extensive rales with prolonged expiration can be heard during acute attacks. Patients with advanced emphysema often have signs of emphysema, see the section on obstructive emphysema.