Basically, The exact cause is unclear. Additionally, They may be related to chronic inflammation of the lining of the sinuses. In detail, They occur more commonly among people who have allergies, cystic fibrosis, aspirin sensitivity, or certain infections. Besides this, About 4% of people currently have nasal polyps while up to 40% of people develop them at some point in their life. Lastly, They most often occur after the age of 20 and are more frequent in males than females
