Dry and wet rales in the lungs are mainly pathological breath sounds in the lungs that are auscultated by stethoscope during physical examination. Dry rales in the lungs are relatively common in inflammatory reactions in the lungs, including acute bronchitis, chronic bronchitis, and bronchial asthma, where the sound of airflow through the mucous membranes of the lungs rubs together. This is because the lungs appear to be congested, edematous, and exuding small amounts of inflammatory secretions due to the inflammatory response. Wet rales are mainly inflammatory secretions in the lungs, such as large, medium, small and fine wet rales. When wet rales appear in the lungs with a fixed location and do not diminish and disappear with coughing, they suggest an inflammatory response in the mucosal tissue of the lungs, mainly manifesting as pneumonia. If it will reduce or even disappear with coughing, it indicates the presence of bronchitis.