Editing Sinusitis (section)

===Classification===
[[File:Otorhinolaryngology - Sinusitis -- Smart-Servier.png|thumb|upright=0.9|Illustration depicting sinusitis, note the fluid in the sini]]

Sinusitis (or rhinosinusitis) is defined as an inflammation of the [[nasal mucosa|mucous membrane]] that lines the [[paranasal sinuses]] and is classified chronologically into several categories:<ref name="Radojicic">{{cite web |url=http://www.clevelandclinicmeded.com/medicalpubs/diseasemanagement/allergy/rhino-sinusitis/ |publisher=[[Cleveland Clinic]] | first = Christine | last = Radojicic |title=Sinusitis |work=Disease Management Project |access-date=November 26, 2012 |url-status=live |archive-url=https://web.archive.org/web/20121114060719/http://www.clevelandclinicmeded.com/medicalpubs/diseasemanagement/allergy/rhino-sinusitis/ |archive-date=November 14, 2012 }}</ref>
* [[Acute (medicine)|Acute]] sinusitis – A new infection that may last up to four weeks and can be subdivided symptomatically into severe and nonsevere. Some use definitions up to 12 weeks.<ref name="pmid25833927">{{cite journal |vauthors=Rosenfeld RM, Piccirillo JF, Chandrasekhar SS, Brook I, Kumar KA, Kramper M, Orlandi RR, Palmer JN, Patel ZM, Peters A, Walsh SA, Corrigan MD |date=April 2015 |title=Clinical practice guideline (update): Adult Sinusitis Executive Summary |journal=Otolaryngology–Head and Neck Surgery |volume=152 |issue=4 |pages=598–609 |doi=10.1177/0194599815574247 |pmid=25833927 |s2cid=206469424 |doi-access=free}}</ref>
* Recurrent acute sinusitis – Four or more full episodes of acute sinusitis that occur within one year
* [[Subacute]] sinusitis – An infection that lasts between four and 12 weeks, and represents a transition between acute and chronic infection.
* [[Chronic (medicine)|Chronic]] sinusitis – When the signs and symptoms last for more than 12 weeks.<ref name="pmid25833927"/>
* Acute exacerbation of chronic sinusitis – When the signs and symptoms of chronic sinusitis exacerbate, but return to baseline after treatment.

Roughly 90% of adults have had sinusitis at some point in their lives.<ref>{{cite journal | vauthors = Pearlman AN, Conley DB | title = Review of current guidelines related to the diagnosis and treatment of rhinosinusitis | journal = Current Opinion in Otolaryngology & Head and Neck Surgery | volume = 16 | issue = 3 | pages = 226–30 | date = June 2008 | pmid = 18475076 | doi = 10.1097/MOO.0b013e3282fdcc9a | s2cid = 23638755 }}</ref>