How common is it for somebody to get nasal polyps?

Nasal polyps: Incidence depends on age and comorbid conditions like cystic fibrosis. "the overall incidence of nasal polyps in children is 0.1%; the incidence in children with CF is 6-48%. Among adults, the incidence is 1-4% overall, with a range of 0.2-28%." http://emedicine.Medscape.Com/article/994274-overview#a0199.

Uncommon: Nasal polyps are not common in childhood. Can be due to allergic disease or cystic fibrosis.

Fairly uncommon: Nasal polyps are not a common occurrence. If you have or expect that you have nasal polyps, i recommend seeing your physician to discuss possible underlying causes.

Very: 15% of the us population has chronic sinusitis, and nasal polyps.

4-5% of population: It has been estimated that the problem of nasal polyposis occurs in about 4-5% of the population in the US. There also is increasing evidence that there is a genetic background for nasal polyposis.