Editing Sinusitis (section)

===By location===
The four paired [[paranasal sinuses]] are the frontal, ethmoidal, maxillary, and sphenoidal sinuses. The [[Ethmoid sinus|ethmoidal sinuses]] are further subdivided into anterior and posterior ethmoid sinuses, the division of which is defined as the [[Ethmoid sinus#Groups of sinuses|basal lamella]] of the [[middle nasal concha]]. In addition to the severity of [[disease]], discussed below, sinusitis can be classified by the sinus cavity it affects:

* [[Maxillary sinus|Maxillary]] – may cause pain or pressure in the maxillary (cheek) region, often experienced as toothache or headache.<ref name="pmid248617783">{{cite journal |vauthors=Ferguson M |date=September 2014 |title=Rhinosinusitis in oral medicine and dentistry |journal=Australian Dental Journal |volume=59 |issue=3 |pages=289–95 |doi=10.1111/adj.12193 |pmid=24861778 |doi-access=free}}</ref>
* [[Frontal sinus|Frontal]] – may cause pain or pressure in the frontal sinus cavity (above the eyes), often experienced as headache, particularly in the forehead area.
* [[Ethmoid sinus|Ethmoidal]] – may cause pain or pressure pain between or behind the eyes,  along the sides of the upper nose ([[Canthus|medial canthi]]), and headaches.<ref name="Terézhalmy-20093">{{cite book |url=https://archive.org/details/physicalevaluati00tere |title=Physical evaluation in dental practice |vauthors=Terézhalmy GT, Huber MA, Jones AC, Noujeim M, Sankar V |publisher=Wiley-Blackwell |year=2009 |isbn=978-0-8138-2131-3 |location=Ames, Iowa |page=[https://archive.org/details/physicalevaluati00tere/page/n37 27] |url-access=limited}}</ref>
* [[Sphenoid sinus|Sphenoidal]] – may cause pain or pressure behind the eyes, though it is often felt at [[Vertex (anatomy)|top of the head]], over the [[Mastoid process|mastoid processes]], or the back of the head.<ref name="Terézhalmy-20093" />