5 Types of Lung Sounds You Should Know About

A physician can listen to a person's lungs to investigate potential issues. By identifying the origin of the sounds, such as the lungs themselves, respiratory tract, blood vessels, muscles, ribs, or diaphragm, healthcare professionals can gain insights into a person's respiratory health. During respiration, various sounds can be produced by the lungs, some of which indicate normal lung function while others may suggest underlying health problems. In this article, we will explore the different types of lung sounds, their potential , and potential options.

Normal Lung Sounds

When a physician listens to a person's lungs, they pay attention to the frequency, intensity, and quality of the sounds. These factors help determine whether the lung sounds are regular or irregular. Respiratory sounds can vary depending on where they occur within the respiratory system. Here are the different types of normal lung sounds:

The sound of normal lung function or vesicular breath sounds

Vesicular breath sounds can be heard by a physician over most of the chest using a stethoscope. These sounds occur when air enters and exits the lungs during respiration. They are gentle, deep, resonant, continuous, and more intense and higher pitched during inhalation than exhalation.

Bronchial breath sounds

Bronchial breath sounds are audible above the trachea during exhalation. They are characterized by being loud, hollow, and high pitched. If a physician hears bronchial breath sounds outside of the trachea, it may indicate a health problem.

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Normal tracheal breath sounds

Normal tracheal breath sounds can be heard above the trachea. They are very loud, harsh, and high pitched.


Wheezing is a high-pitched, continuous sound that may be audible with or without a stethoscope. It can be classified into three groups:

Monophonic wheezing

Monophonic wheezing produces a single note and can occur during inhalation or exhalation. It may have a constant or variable frequency and can last for a prolonged duration or occur during both phases of respiration.

Polyphonic wheezing

Polyphonic wheezing has multiple notes and occurs during exhalation. It may increase in pitch towards the end of expiration.


Wheezes are brief, whistling breath sounds that occur during inhalation.

Wheezing can be caused by blockages or narrowing of the airways, with potential causes including asthma, chronic obstructive pulmonary disease (COPD), tumors, airway obstruction from a foreign body, or accumulation of mucus in the airways.


Crackles, also known as rales, are intermittent sounds that are typically heard during inhalation. They can resemble bubble sounds, pops, or rattles. Crackles can be classified as follows:

Fine crackles

Fine crackles occur in the small airways and are soft and high pitched. They may occur more frequently during breathing than coarse crackles and only happen during inhalation.

Medium crackles

Medium crackles result from air bubbles passing through mucus in the small bronchi. They are heard in the tubes that carry air from the trachea to the lungs. These crackles occur during inhalation.

Coarse crackles

Coarse crackles occur in the larger bronchi and are loud, low pitched, and longer in duration than fine crackles. They primarily occur during inhalation but can also happen during exhalation.

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Crackles can be caused by fluid in the lungs, improper lung inflation, pneumonia, COPD, interstitial lung diseases, heart failure, or chronic bronchitis.


Rhonchi are coarse sounds that can be heard during respiratory examination. They are caused by the vibration of the airways due to the movement of air and secretions. Rhonchi can indicate the presence of airway blockages or narrowing. These sounds can be heard in conditions such as COPD, bronchiectasis, or when there is an accumulation of mucus in the airways.

In conclusion, when a physician listens to a person's lungs, they can identify various lung sounds that provide insights into the individual's respiratory health. From normal lung sounds to abnormal ones like wheezing, crackles, and rhonchi, these sounds can indicate potential underlying health issues. Further diagnostic tests and evaluation are often needed to determine the exact cause and appropriate treatment. It is important to consult a healthcare professional if any unusual lung sounds are observed or if there are concerns about respiratory health.

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