Nasal polyps can occur in association with more general diseases such as adult-onset asthma; an uncommon association is with aspirin intolerance, and very occasionally they occur in children with cystic fibrosis.
Adult-onset asthma rather than childhood asthma is associated with nasal polyps. 20-40% of patients with polyps will have asthma as well. Eight in every 100 patients with polyps also have asthma and aspirin sensitivity, and in these patients the polyps tend to recur more than in other people.
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If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.