The true cause of<unk> s is unknown, but they are thought to be due to recurrent infection or inflammation.<unk> s arise from the lining of the sinuses.<unk>  mucosa, particularly in the region of middle meatus becomes swollen due to collection of extracellular fluid. This extracellular fluid collection causes<unk>  formation and protrusion into the<unk>  cavity or sinuses.<unk> s which are sessile in the beginning become pedunculated due to gravity. In people with<unk> s due to aspirin or NSAID sensitivity, the underlying mechanism is due to disorders in the metabolism of arachidonic acid. Exposure to cycloxygenase inhibitors such as aspirin and NSAIDs leads to shunting of products through the lipoxygenase pathway leading to an increased production of products that cause inflammation. In the airway, these inflammatory products lead to symptoms of asthma such as wheezing as well as<unk>  formation.
Nasal polyp
Nasal septal abscess
Nasal vestibulitis
Trachoma
Nasal septum perforation
Aerosinusitis
Adenoiditis
Rhinosinusitis