Large polyps can obstruct the airway and block drainage from the sinuses.
Sinus infections can result from fluid accumulating in the blocked sinuses.
Children with nasal polyps sound congested and are often mandatory mouth breathers because of chronic nasal obstruction . A runny nose or infected nose is common. About one out of four people with cystic fibrosis have nasal polyps. Frequently, no specific cause can be found. Underlying conditions such as allergies or infections can be treated to avoid the development of polyps.