Chronic sinusitis often coexists with chronic rhinitis and is called rhinosinusitis. Sinusitis is an inflammatory lesion involving the nasal cavity and one or more sinus mucosa. The mucosa of nose and paranasal sinuses is continuous, and the inflammation of paranasal mucosa is often caused by the inflammation of nasal mucosa. The causes may be mucosal ciliary system injury, (bacterial) infection, allergy and other causes of mucosal swelling, and only a few are caused by physical obstruction caused by morphological/anatomical variation of nasal cavity or sinus. The ostiomeatal complex of sinus is a functional structure consisting of maxillary sinus ostium, anterior ethmoid sinus and its opening, ethmoid funnel, semilunar fissure and middle nasal meatus, which plays a major role in the pathogenesis of sinusitis. The most basic element is to maintain the best nasal ventilation and cleanliness. The opening of sinus ostium can effectively affect the synthesis and secretion of mucus; In addition, it makes the mucociliary system easy to remove particles and bacteria.

If the sinus ostium is too small relative to mucus, mucus secretion increases (such as upper respiratory tract infection), or cilia function is damaged, problems will occur. Secretion stagnation and bacterial excretion stop will cause or aggravate the inflammatory reaction of mucosa, and at the same time, mucosal ventilation will be reduced, leading to ciliary dysfunction.

The consequences are more serious.