Nasal polyps are polypoidal masses arising mainly from the mucous membranes of the nose and paranasal sinuses. They are overgrowths of the mucosa that frequently accompany allergic rhinitis. They are freely moveable and non-tender.
Symptoms of polyps include nasal block, sinusitis, anosmia (that is, loss of smell), and secondary infection leading to headache. Despite removal by surgery, nasal polyps are found to recur in about 70% of cases. Sinus surgery requires great amount of precision as this involves risk of damage to orbit matter.