Nasal polyps are soft, painless, noncancerous growths lining the nose or sinuses that often occur in groups. The exact cause of nasal polyps is not fully understood, but research suggests that they are linked to chronic inflammation of the nasal passages and sinuses that lasts more than 12 weeks. Inflammation can be caused by a variety of factors, including:

• Allergies: People with allergies have an increased risk of developing nasal polyps.

• Asthma: Nasal polyps are more common in people with asthma.

• Chronic sinus infections: Chronic inflammation of the nasal passages and sinuses can lead to the development of nasal polyps.

• Drug sensitivities: Some people may develop nasal polyps as a result of a sensitivity to certain medications, such as aspirin.

• Immune disorders: People with certain immune disorders may be at an increased risk of developing nasal polyps.

Infection may also play a role in the development of nasal polyps, especially by bacteria called Staphylococcus aureus. While small nasal polyps may not cause symptoms, larger growths or groups of nasal polyps can block the nose, leading to breathing problems, loss of smell, and infections. If you suspect you have nasal polyps, it is important to see a doctor for diagnosis and treatment.