Nasal polyps are not true polyps but rather are probably caused by inflammation in the nose.
They look like peeled grapes but are basically fluid-filled sacs.
They can be found anywhere in the sinuses or nose and commonly are associated with sinus infections.
They can cause a blockage of the drainage holes (ostia) from the sinuses, causing a back-up of mucus in the sinuses.
Nasal polyps are often associated with asthma and can be made worse in some people by ingesting aspirin or related drugs.
Treatment involves steroids, treatment of sinusitis, and treating any allergies.
They may sometimes need to be removed surgically, but surgical removal doesn't mean that they won't come back.
They are not precancerous in most cases.
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