The presence of dry rales in the lungs is a pathologic murmur that is detected on auscultation during physical examination. The presence of dry rales in the lungs is generally associated with relatively low secretions in the airways, with congestion and edema of the airways, when the relative inflammatory response of the airways is more pronounced. As the airflow passes through the airway passages, it rubs against the mucosal walls of these inflammatory reactions of the airway and breath sounds appear. In contrast, wet rales, which are relatively inflammatory secretions in the airway, when the airflow passes through the airway, will impact with the secretions and result in wet rales, also known as blistering sounds. In clinical practice, a fixed distinctive wet rales on auscultation, such as small and medium vesicular sounds are usually common in pneumonia, and if they are variable large vesicular sounds are usually bronchitis.