Subglottic stenosis causes warning signs management and treatment

Subglottic stenosis is one of the conditions that may start mildly at first, but its seriousness lies in its direct impact on the airway. It occurs when there is a narrowing in the area just below the vocal cords, which leads to varying degrees of difficulty in airflow.In some cases, the condition develops gradually without the patient noticing early symptoms. It may also mimic other respiratory diseases such as asthma or chest allergies, which makes early and accurate diagnosis very important to avoid complications.In this article from Dalili Medical, we will explore everything related to subglottic stenosis, including its causes, symptoms, and precise diagnostic methods. We will also discuss the latest medical and surgical treatment options, as well as the most important tips for managing the condition and improving breathing quality and daily life.

What is Subglottic Stenosis?

Subglottic stenosis is a narrowing or obstruction of the airway just below the vocal cords. It is considered a potentially serious condition because it directly affects breathing.

It may develop after airway trauma, such as prolonged use of a breathing tube (intubation), repeated infections, or in some cases due to unexplained scarring (idiopathic fibrosis) in the subglottic region.

⚠️ Is Subglottic Stenosis Dangerous?

Yes, it can be dangerous if the narrowing is severe.
It may cause significant breathing difficulty and, in advanced cases, can become life-threatening.

However, mild to moderate cases are often treatable with proper medical follow-up and show good improvement.

What is the difference between Subglottic Stenosis and Asthma?

Asthma: affects the lower airways (bronchi and lungs).
Subglottic stenosis: affects the upper airway just below the larynx (voice box).

A key difference is:

Subglottic stenosis → noisy breathing mainly during inhalation (inspiration)
Asthma → wheezing mainly during exhalation (expiration)

❗ Can it be misdiagnosed as asthma?

Yes, in some cases.
Because symptoms such as shortness of breath and wheezing may look similar, misdiagnosis can happen.

That’s why diagnostic tools like laryngoscopy or CT scans are essential for accurate diagnosis.

Can subglottic stenosis come back after treatment?

Yes, recurrence can happen, especially in cases with significant scarring or ongoing causes such as:

Acid reflux (GERD)
Autoimmune diseases
Chronic inflammation

Regular follow-up is very important to reduce recurrence risk.

Does it affect daily life?

Mild cases: minimal or no impact
Moderate cases: may affect physical activity and breathing during exertion
Severe cases: can interfere with sleep, speech, and normal breathing

Who can get it — children or adults?

It can affect both:

Children: may be congenital or due to prolonged intubation
Adults: often caused by prolonged intubation, inflammation, or autoimmune diseases

Does it worsen over time without treatment?

Yes, in many cases it gradually worsens, leading to increased airway narrowing and more severe breathing difficulty if the underlying cause is not treated.

Is exercise allowed?

Light activity may be allowed in mild cases.
However, in moderate to severe cases, strenuous exercise is usually avoided because it may worsen breathing symptoms.

Does it permanently affect the voice?

It may cause hoarseness or voice changes.
In many cases, voice improves after proper treatment depending on severity and location of the narrowing.

Can patients live normally with it?

Mild cases: yes, usually normal life
Moderate cases: may require lifestyle adjustments and medical follow-up
Severe cases: often require medical or surgical intervention to restore normal breathing

Does smoking affect the condition?

Yes. Smoking worsens inflammation, delays healing, and may increase the severity of airway narrowing.

Does pregnancy affect subglottic stenosis?

Pregnancy does not usually worsen the condition directly, but it may increase the feeling of shortness of breath due to physiological changes. Close medical monitoring is recommended if the condition exists.

Do certain foods affect it?

Food does not directly treat the condition, but:

Spicy or fatty foods may worsen acid reflux (GERD)
GERD can irritate the airway and worsen symptoms

Light, non-irritating foods are generally preferred.

Is laryngoscopy painful?

No.
It is usually done under local anesthesia or sedation and is considered a safe and quick procedure for accurate diagnosis.

⚡ Can it appear suddenly?

It usually develops gradually, but symptoms may appear suddenly in some cases, such as after infection or immediately after removal of a breathing tube.

Are there alternatives to surgery?

Yes, depending on severity:

Mild cases: medications and endoscopic dilation
Severe cases: surgery is often the most effective option

Is it a rare condition?

Yes, it is relatively uncommon in the general population, but more frequently seen in ICU patients or those who have undergone prolonged intubation.

Types of Subglottic Stenosis

Subglottic stenosis can be classified into several types based on the cause, shape, and severity of the narrowing. This classification helps doctors choose the most appropriate treatment plan for each case.

First: Types based on cause

1. Acquired Subglottic Stenosis

This is the most common type and develops after birth due to various factors, such as:

Prolonged use of a breathing tube (endotracheal intubation)
Injuries or surgical procedures in the larynx
Severe airway infections
Autoimmune diseases
Chronic acid reflux (GERD)

2. Congenital Subglottic Stenosis

Present at birth
Occurs due to incomplete development of the larynx during fetal growth
May sometimes be associated with other congenital airway abnormalities

Second: Types based on shape

1. Circumferential stenosis

Narrowing occurs in a ring-like shape around the airway
Reduces the airway diameter evenly from all sides
Often caused by scarring after prolonged intubation

2. Eccentric stenosis

Narrowing occurs on one side or unevenly
Usually caused by localized injury or inflammation

Third: Types based on severity (Meyer–Cotton grading system)

Grade I

Less than 50% airway obstruction
Mild or minimal symptoms

Grade II

51% to 70% obstruction
Shortness of breath during physical activity

Grade III

71% to 99% obstruction
Significant breathing difficulty even with minimal exertion

Grade IV

Near complete airway obstruction
A life-threatening emergency if not treated immediately

⚠️ Causes of Subglottic Stenosis

Subglottic stenosis is a narrowing in the airway just below the vocal cords. It can lead to breathing difficulty and noisy breathing during inhalation. Its causes include:

1. Prolonged use of a breathing tube (most common cause)

Long-term mechanical ventilation in intensive care units
Constant pressure of the tube on the airway wall
Leads to inflammation and scarring (fibrosis), resulting in narrowing

2. Laryngeal injuries or surgeries

Surgical procedures involving the larynx or trachea
Direct neck trauma
May cause scar tissue formation and airway narrowing

3. Severe or chronic infections

Acute bacterial or viral infections
Recurrent inflammation leading to scar tissue over time

4. Autoimmune diseases

Conditions where the immune system attacks healthy tissues
Examples include vasculitis and other chronic immune disorders

5. Congenital causes (rare)

Present from birth
Due to abnormal development of the larynx during fetal life

6. Chronic acid reflux (GERD)

Repeated exposure of the airway to stomach acid
Causes chronic irritation and eventual scarring

7. Idiopathic causes (unknown)

No clear cause can be identified
More commonly observed in females in some cases

Symptoms of Subglottic Stenosis

Symptoms vary depending on the degree of narrowing and usually develop gradually over time.

1. Shortness of breath

Most common symptom
Initially occurs during exertion
May progress to breathing difficulty at rest in severe cases

2. Stridor (noisy breathing during inhalation)

High-pitched wheezing sound during breathing in
More noticeable during deep breathing or physical activity

3. Chronic cough

Persistent or recurrent cough without a clear cause
May worsen at night or during exertion

4. Hoarseness of voice

Voice becomes weak or raspy
Due to indirect effect on the vocal cords

5. Easy fatigue

Patient becomes tired quickly even with minimal effort
Such as walking or climbing stairs

Sixth: Feeling of tightness or suffocation

The patient may feel that they are not getting enough air.
This sensation may worsen in certain positions or during sleep.

⚠️ Seventh: In severe cases

Marked difficulty breathing even at rest
Bluish discoloration of the lips or extremities due to low oxygen levels
Anxiety or restlessness caused by breathing difficulty

Diagnosis of Subglottic Stenosis

Diagnosing subglottic stenosis relies on combining clinical symptoms, physical examination, and advanced diagnostic tests, since the condition can mimic other diseases such as asthma or chronic chest conditions.

First: Medical history

The doctor collects detailed information, including:

Gradual or sudden onset of breathing difficulty
History of prolonged intubation (breathing tube use in ICU)
Previous surgeries involving the larynx or neck
Recurrent respiratory infections or acid reflux disease
Pattern and progression of symptoms over time

Second: Clinical examination

The physical examination may reveal:

Inspiratory stridor (noisy breathing during inhalation)
Visible breathing difficulty
Voice changes such as hoarseness or weakness

Third: Diagnostic tests

1. Laryngoscopy

The most important and accurate diagnostic tool
A thin scope is inserted to directly visualize the larynx
Helps determine the exact location and severity of the narrowing

2. Bronchoscopy

Examines the entire trachea and lower airway
Determines the length, shape, and extent of stenosis

3. CT scan (Computed Tomography)

Provides detailed imaging of the neck and chest
Shows the airway structure from both inside and outside
Especially useful in complex or severe cases

4. Pulmonary Function Tests (PFTs)

Measure airflow in and out of the lungs
Show a characteristic pattern indicating upper airway obstruction

Additional tests (depending on the case)

Immune system tests if autoimmune disease is suspected
Acid reflux evaluation if GERD symptoms are present

⚠️ Risks of Subglottic Stenosis

The risks depend on the severity and progression of the narrowing, and they increase as airway obstruction worsens or treatment is delayed.

1. Severe breathing difficulty

Worsening airway narrowing over time
Shortness of breath even at rest
Constant feeling of air hunger or suffocation

2. Low oxygen levels

Reduced airflow leads to decreased oxygen in the body, causing:

Severe fatigue and dizziness
General weakness
Bluish lips or fingertips in advanced cases

3. Sudden choking episodes

Severe or near-complete airway blockage may occur suddenly
This is a medical emergency requiring immediate intervention

4. Respiratory failure (advanced cases)

Near-total airway obstruction
Inability to maintain adequate oxygen levels
Life-threatening condition

5. Impact on daily life

Difficulty performing simple daily activities
Reduced physical endurance
Sleep disturbances due to breathing problems

6. Recurrent respiratory infections

Poor airflow clearance increases infection risk
Frequent cough and mucus production

7. Psychological impact

Anxiety and constant fear of choking
Stress due to breathing difficulty

Medical treatment of Subglottic Stenosis

Drug therapy is an important part of management, especially in mild cases or as supportive treatment before or after procedures. However, medications alone are often insufficient in moderate to severe stenosis, especially when fibrosis is present.