Coarse lung sounds mainly refers to the roughness of lung breath sounds, the reason is that the airway mucosa has different degrees of inflammatory reaction, mainly mucosal congestion, edema or even inflammatory secretion exudation, and even accompanied by different degrees of sputum thrombus obstruction. Infectious and non-infectious factors commonly cause inflammatory reactions in the airways of the lungs. Infectious factors include bacterial, viral, and Mycobacterium tuberculosis infections of the lungs, which may be accompanied by coughing, coughing up yellowish sputum, chest tightness, chest pain, and even a tendency to gradually rise in body temperature. In addition, non-infectious factors including bronchial asthma, as well as idiopathic interstitial and diffuse pulmonary fibrosis, and bronchiectasis may lead to the clinical manifestation of rough breath sounds.