Nasal polyps are noncancerous growths along the lining of your nasal passages or sinuses. Large polyps can obstruct nasal passages and lead to breathing challenges, anosmia (loss of smell), recurrent sinus infections and other complications.
Adults, particularly those with asthma, frequent sinus infections and allergies, are more susceptible to developing nasal polyps. Children living with cystic fibrosis also often develop nasal polyps.