Nasal polyps: Understanding the underlying causes and risk factors

Nasal polyps are soft, non-cancerous growths that develop in the lining of the nose or sinuses. While they are relatively common, most people do not fully understand what causes them or why some individuals are more at risk than others.

In this article, consultant ENT Surgeon Mr Samit Unadkat explores the main underlying causes and risk factors for nasal polyps, helping you better understand this condition and the factors that can contribute to its development.

What are nasal polyps?

Nasal polyps are small, teardrop-shaped growths that occur when the lining of the nasal passages or sinuses becomes chronically inflamed. They can vary in size and number, sometimes causing a blocked nose, reduced sense of smell, or frequent sinus infections. While they are not dangerous, they can significantly impact quality of life if left untreated.

Causes of nasal polyps

Nasal polyps may develop due to the following causes:

Chronic inflammation

The most common cause of nasal polyps is long-term inflammation in the nasal and sinus passages. This inflammation can be triggered by various conditions, including chronic sinus infections, allergies, and asthma. The immune system reacts to irritants, causing the tissue lining the nose to swell and form polyps over time.

Allergic reactions

People with allergies, particularly hay fever or reactions to dust mites and pet dander, are more prone to developing nasal polyps. Allergens can trigger persistent inflammation, which may eventually lead to polyp formation.

Asthma and respiratory conditions

Individuals with asthma, especially aspirin-sensitive asthma, have a higher likelihood of developing nasal polyps. Similarly, cystic fibrosis, a genetic disorder affecting mucus production, can increase the risk due to thicker mucus obstructing nasal passages.

Risk factors for nasal polyps

Several factors can increase the likelihood of developing nasal polyps, including:

Age and gender

Nasal polyps are more common in adults, particularly those aged 40 to 60. Men are slightly more likely to develop them than women, though the reasons for this are not entirely understood.

Family history

There is some evidence that nasal polyps can run in families, suggesting a genetic component. If close relatives have experienced nasal polyps, your risk may be higher.

Environmental triggers

Exposure to certain irritants, such as smoke, chemical fumes, or dust, can increase the risk of chronic nasal inflammation, which may lead to polyp formation.

While nasal polyps are not usually life-threatening, timely intervention can improve breathing, reduce infections, and enhance overall quality of life.