Lena Torres
Breath sounds are the noises produced by the structures of the lungs during breathing. Normal breath sounds are usually soft and smooth, and they occur in all parts of the chest area, including above the collarbones and at the bottom of the rib cage. However, abnormal breath sounds may include wheezing, crackling, or whistling. These adventitious sounds can be caused by a variety of factors, including mucus in the airways, swelling, or blockages, and they can indicate underlying health issues. If you are experiencing abnormal breath sounds, it is important to consult a doctor for a proper diagnosis and treatment.
| Characteristics | Values |
|---|---|
| Normal lung sounds | Smooth and soft |
| Adventitious/abnormal lung sounds | Crackling, whistling, gurgling, wheezing, snoring, rattling, bubbling, clicking, etc. |
| Causes of abnormal lung sounds | Mucus, swelling, blockages, inflammation, fluid buildup, foreign objects, infections, etc. |
| Diagnosis | Auscultation with a stethoscope, pulmonary function test, imaging tests, blood tests, sputum testing |
| Treatment | Medication, breathing treatments, hospitalization in severe cases |
| When to see a doctor | Continuous abnormal breathing sounds, sudden or severe breathing difficulties, emergency signs like cyanosis |
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What You'll Learn
Wheezing: A continuous, high-pitched sound
Wheezing is a continuous, high-pitched sound that may be heard when breathing in and out. It is indicative of a narrowed airway that limits airflow in and out of the lungs. Wheezing is often associated with asthma, a lung disease that causes swelling, narrowing, and blockage of airways due to excess mucus. However, it can also be caused by other conditions such as Chronic Obstructive Pulmonary Disease (COPD) or cystic fibrosis. In children, wheezing may be a result of respiratory infections, foreign objects in the airways, or floppy tissues in the respiratory tract.
Wheezing can sometimes be loud enough to be heard without a stethoscope. It is often described as a breathy whistle or a sibilant rhonchus, which is easier to hear during exhalation. The sound is produced due to inflammation and narrowing of the bronchial tubes, which can be caused by various underlying conditions.
To diagnose the cause of wheezing, a doctor will review an individual's medical history, including current and past conditions, medications, and the timing and context of the atypical breath sounds. They may also perform a physical examination and recommend additional tests, such as imaging scans or blood tests, to identify potential causes.
It is important to seek medical attention if you are experiencing wheezing or other abnormal breathing sounds. While they are often treatable, these symptoms can indicate underlying health issues and may require medication or breathing treatments to alleviate the condition.
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Stridor: A harsh, high-pitched whistle
Stridor is a continuous, harsh, high-pitched whistle or squeaking sound. It is a type of lung sound that healthcare providers can hear in the airways when a patient breathes in and out. It is usually heard during inspiration (when a person breathes in). It is caused by turbulent airflow in the larynx or lower in the bronchial tree. It is indicative of a narrowed or obstructed airway.
Stridor is a physical sign and not a diagnosis. It is a symptom that points to a specific airway disorder. It is often indicative of serious airway obstruction from severe conditions. In children, it may be caused by croup or papillomatosis. In rare cases, it can occur due to trauma or foreign body aspiration. In infants, stridor usually indicates a congenital disorder, including laryngomalacia, vocal cord paralysis, or subglottic stenosis. Laryngomalacia is caused by soft structures and tissues that obstruct the airway. It often goes away as a child ages and their airways harden. Subglottic stenosis occurs when the voice box is too narrow, and many children outgrow this condition, although surgery may be necessary in severe cases. Subglottic hemangioma occurs when a mass of blood vessels forms and obstructs the airway, and vascular rings occur when an outer artery or vein compresses the windpipe.
In adults, stridor is most commonly caused by tonsillitis or epiglottitis. It can also be caused by a foreign body lodged in the airway or a laryngeal tumour. Stridor should always be medically examined to establish its cause. Visualization of the airway by medical experts may be required. Treatments depend on several factors, including the cause of the noisy breathing and the severity of the condition. Treatment options include observation, medication, endoscopic surgery, and open surgery.
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Crackles: Fluid in the lungs
One of the reasons your breathing might sound weird is that you have fluid in your lungs. This condition is known as "crackles", which are discontinuous, interrupted, or explosive lung sounds. They may sound like rattling, bubbling, or clicking. Crackles occur when the small air sacs in the lungs, called alveoli, fill with fluid and there is air movement in the sacs, such as when you're breathing.
The alveoli are the site of gas exchange in the lungs, where oxygen is taken up into the bloodstream and carbon dioxide is released from the blood into the lungs to be exhaled. When these air sacs fill with fluid, it can cause the crackling sounds you may hear when breathing. The sound of crackles can vary, with fine crackles being short and high-pitched, and coarse crackles being lower in pitch and lasting longer. Crackles are more likely to be heard by a doctor when you breathe in.
Crackles in the lungs can be caused by several conditions, including pneumonia, heart failure, and cystic fibrosis. Pneumonia is an infection in the lungs that causes the lung tissues to swell and fill with fluid or pus. Congestive heart failure occurs when the heart can't pump blood effectively to meet the body's needs, which can lead to fluid accumulation in the lungs. Cystic fibrosis is a condition where thick mucus clogs the airways, making it difficult to breathe.
If you are experiencing crackles or other abnormal breathing sounds, it is important to consult a doctor for a proper diagnosis. They will use a stethoscope to listen to your lungs and may order additional tests to determine the underlying cause. Treatment options will depend on the specific diagnosis and the severity of your symptoms.
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Rhonchi: Continuous, low-pitched snoring sounds
Rhonchi, or the sound of continuous, low-pitched snoring, is one of the most common abnormal lung sounds. It is caused by an obstruction or blockage of the larger airways of the lungs by fluid, mucus, or other secretions. The sound is created as air pockets pass roughly through the accumulated fluids. Rhonchi are often described as gurgling or bubbling sounds and can be heard with a stethoscope. They are typically associated with large airway obstruction, which can be caused by secretions lining the airways.
Rhonchi are usually heard when a person breathes out (exhales) and are temporarily relieved by coughing. The sound might move to different parts of the chest when you cough, moving mucus around. The sound is sometimes called "sonorous rhonchus". The term "rhonchus" is probably best avoided, as many use the term to refer to the coarse discontinuous sounds often heard in patients with airway secretions.
Rhonchi are generally coarse sounds heard in specific lobes that tend to correspond to underlying infection. They are associated with obstructive lung diseases, in which damage to the airways causes air to leave the lungs more slowly than normal during exhalation. Examples of obstructive lung diseases that can cause rhonchi include chronic obstructive pulmonary disease (COPD), asthma, bronchiectasis, and cystic fibrosis.
Rhonchi can be distinguished from other abnormal lung sounds such as rales (crackles) and stridor. Rales are discontinuous, interrupted, or explosive lung sounds that may sound like pulling velcro open. They are caused by the collapse of air sacs due to inflammation or scarring of the lung tissues. Stridor, on the other hand, is a continuous, harsh, high-pitched whistle or squeaking sound usually caused by a blockage of airflow in the windpipe or throat.
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Blocked airways: Foreign objects, swelling, or growths
Blockage in the upper airway occurs when the upper breathing passages become narrowed or blocked, making breathing difficult. The areas in the upper airway that can be affected include the windpipe (trachea), voice box (larynx), or throat (pharynx).
Foreign objects, such as food, breathed-in foods, pieces of a balloon, buttons, coins, and small toys, can cause acute airway obstructions. Children are at a higher risk of foreign object obstruction than adults due to their smaller airways, tendency to put small objects in their mouths and noses, and improper chewing of food before swallowing.
In addition to foreign objects, allergic reactions can also cause airway blockage due to the swelling of the trachea or throat. People with severe allergies to food, insect stings, or medicines such as antibiotics and ACE inhibitors may experience rapid swelling of the throat and tongue, leading to a near or complete airway obstruction.
Tonsillitis, epiglottitis, and allergic reactions can also cause swelling and blockage of the airway. Furthermore, abnormal growths such as tumours or abscesses can obstruct the airway and impact breathing sounds.
If you or someone you know is experiencing breathing difficulties due to a potential blockage, it is important to seek immediate medical attention.
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Frequently asked questions
Abnormal breathing sounds can be caused by a variety of factors, including:
- Mucus, swelling or blockages in the airways
- Lung conditions such as bronchitis, pneumonia, cystic fibrosis, or asthma
- Foreign objects in the lungs
- Underlying medical conditions, such as infections or inflammation
- Sleep apnea
- Recurrent Respiratory Papillomatosis
Abnormal breathing sounds can include:
- Crackles or rales: Discontinuous, interrupted, or explosive sounds that may sound like rattling, bubbling, or clicking
- Wheezing: Continuous, high-pitched whistling or hissing sounds
- Rhonchi: Continuous, low-pitched sounds that may sound like snoring
- Stridor: Continuous, harsh, high-pitched whistling or squeaking sounds
Abnormal breathing sounds often indicate common and treatable disorders. However, if you experience sudden or severe breathing difficulties, seek emergency medical attention. Additionally, if you notice any other symptoms or if the abnormal breathing sounds do not resolve on their own, it is recommended to consult a doctor for a proper diagnosis and treatment.
To diagnose the cause of abnormal breathing sounds, a doctor will typically:
- Review your medical history, including any current or past medical conditions and medications
- Perform a physical examination, including listening to your lungs with a stethoscope
- Order additional tests, such as imaging tests (X-ray or CT scan), blood tests, pulmonary function tests, or sputum culture to detect foreign organisms in the lungs
