Editing Nasal polyp (section)

==Causes==
[[File:Paranasal sinuses numbers.svg|thumb|upright=1.3|[[Paranasal sinuses]]: 1. frontal sinuses, 2. ethmoid sinuses (ethmoidal air cells), 3. sphenoid sinuses, 4. maxillary sinuses]]
The exact cause of nasal polyps is unclear.<ref name="New2008" /> They are, however, commonly associated with conditions that cause long term [[inflammation]] of the sinuses.<ref name="Man2015" /> This includes [[chronic rhinosinusitis]], [[asthma]], [[aspirin]] sensitivity, and [[cystic fibrosis]].<ref name="Man2015" />

Various additional diseases associated with polyp formation include:<ref>{{Cite book |last=Behrbohm |first=Hans |url=https://books.google.com/books?id=fd6zAAAAQBAJ&pg=PA167%7C |title=Ear, Nose, and Throat Diseases: With Head and Neck Surgery |last2=Kaschke |first2=Oliver |date=1 Jan 2011 |publisher=Thieme |isbn=9783131702135 |language=en}}</ref>
{{columns-list|colwidth=30em|
* [[Allergic fungal sinusitis]]
* [[Kartagener's syndrome]]
* [[Young's syndrome]]
* [[Eosinophilic granulomatosis with polyangiitis]]
* Nasal [[mastocytosis]]
}}

[[Chronic rhinosinusitis]] is a common medical condition characterized by symptoms of sinus inflammation lasting at least 12 weeks. The cause is unknown and the role of microorganisms remains unclear. It can be classified as either with or without nasal polyposis.<ref name="Man2015">{{Cite book |last=DeMuri |first=Gregory |title=Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases |year=2015 |isbn=978-0443068393 |pages=774–784}}</ref>

[[Cystic fibrosis]] (CF) is the most common cause of nasal polyps in children. Therefore, any child under 12 to 20 years old with nasal polyps should be tested for CF.<ref name="Peds2016" /><ref name="Fer2017">{{Cite book |last=Insalaco |first=Louis |title=Ferri's Clinical Advisor |year=2017 |pages=885}}</ref> Half of people with CF will experience extensive polyps leading to nasal obstruction and requiring aggressive management.<ref name="Peds2016" />