Nasal Polyps are not a disease, but the result of inflammation in your nose or sinuses. The inflammation allows fluid to build up in the cells of your nose and sinuses. Over time, as gravity pulls on these fluid-filled cells, they can develop into Nasal Polyps.
Inflammation that causes nasal mucosa to collect in these polyps can be likened to a stagnant pond, which increases your chances of having Sinusitis. Nasal Polyps grow around the edges of the nose or your sinus cavities. Polyps do not usually cause any problems when they are small, but an inflammation in the sinuses from an allergy or a viral or bacterial infection, can make the polyps grow faster.