Bronchitis causes crackling lungs in the form of wheezing that may also sound moist. Bronchitis is almost always the result of a virus and it tends to appear in the aftermath of a cold, flu, or similar illness. Whether itâs acute or chronic, bronchitis is when the bronchial tubes become inflamed. Pneumonia can also cause something called an âE to Aâ change, which is when the letter âE,â if said aloud, sounds like an âAâ through the stethoscope. When listening to your lungs, pneumonia crackles present as moist rales due to the movement of fluid within the air sac. Pneumonia can have viral or bacterial causes, but in all cases itâs characterized by an inflammation of the air sac in one or both lungs along with a possible buildup of fluids. During rhonchi sounds, airflow may be blocked or is otherwise âroughâ during its passage. Rhonchi: Rhonchi falls under the wheezing category, but its sounds resemble snoring and happen in the larger airways.Stridor sounds are more likely to be the result of something obstructing the trachea or the back of the throat, and the sounds are more pronounced when inhaling. Stridor: Stridor is similar to wheezing but originates closer to the trachea and has a higher-pitched, almost musical quality.Rales can be further subcategorized as moist, dry, fine, or coarse depending on the nature of the sound. They tend to happen when air enters an otherwise closed space. Rales: Rales have a bubbling, clicking, or rattling sort of sound that occurs when you inhale.

Occasionally, wheezing can be pronounced enough that your doctor can hear it without a stethoscope.

Wheezes: A wheeze is a sort of high-pitched sound that comes from air trying to get through a narrowed passageway.

Crackling in the lungs when breathing out or in falls into one of the following groups: Some conditions are only associated with certain lung sounds, so knowing what kind of crackling your lungs have helps the differential diagnosis.

There are four broad categories for lung crackles that doctors use to better classify their observations.

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