The fluid that is present in the air sacs is what causes the crackles and bronchial breath sounds that we hear in the right lower lobe.
When the tiny air sacs in the lungs fill with fluid and there is air movement, like when you breathe, crackles develop. When someone gets pneumonia or heart failure, their air sacs become swollen with fluid. The bronchial tubes narrow and swell, which causes wheezing.
When someone is exhaling, it is typical for a doctor to hear bronchial noises across the trachea. However, bronchial noises coming from other places may indicate a problem with the lungs. Air is present in the pulmonary tissue of the normal lung, which muffles sound.
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