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What are nasal polyps? Nasal polyps are soft, non-cancerous growths that develop in the lining of the nose or sinuses. They result from chronic inflammation in the lining. What triggers the inflammation is not always clear. Nasal polyps can affect anyone, they are more common in adults older than 40 and in adults and children with conditions such as asthma, chronic sinus infections (chronic sinusitis), hay fever (chronic rhinitis) and cystic fibrosis — a serious, inherited disorder that causes respiratory, digestive and reproductive problems. What are the causes? Nasal polyps are not a disease. They are the end product of the ongoing inflammation that may result from viral or bacterial infections, from allergies or from an immune system response to fungus. Chronic inflammation causes the blood vessels in the lining of the nose and sinuses to become more permeable, allowing water to accumulate in the cells. Over time, as gravity pulls on these waterlogged tissues, they may deve...