The bronchoalveolar breath sounds are a mixture of bronchial breath sounds and alveolar breath sounds. The nature of inspiratory sounds is similar to normal alveolar breath sounds, but the pitch is higher and louder. The nature of the expiratory sounds is similar to the bronchial breath sounds, but the intensity is slightly weaker, the pitch is slightly lower, the tube-like nature is less and the expiratory phase is shorter, and there is a very short gap between inspiration and expiration. The inspiratory phase of bronchoalveolar breath sounds is approximately the same as the expiratory phase. What are the symptoms of bronchoalveolar sounds that can be diagnosed? In normal individuals, bronchoalveolar breath sounds can be heard at the level of the 1st to 2nd rib spaces on either side of the sternum, at the level of the 3rd to 4th thoracic vertebrae in the interscapular region, and in the anterior and posterior parts of the lung apices. When bronchoalveolar breath sounds can be heard in other areas, they are abnormal and suggest the presence of a lesion. Abnormal bronchoalveolar breath sounds are bronchoalveolar breath sounds that are heard in the region of normal alveolar breath sounds. The mechanism for this is the presence of a small area of solid lung tissue mixed with normal air-containing lung tissue, or a deeper area of solid lung tissue covered by normal lung tissue. It is commonly heard in the early stages of bronchopneumonia, tuberculosis, lobar pneumonia, or in areas of pulmonary insufficiency above a pleural effusion.