Grow in inflamed tissue of the nasal mucosa. The mucosa
Is a very wet layer that helps protect the inside of your nose and sinuses and humidifies the air you breathe. During an infection or allergy-induced irritation, the nasal mucosa becomes swollen and red, and it may produce fluid that drips out. With prolonged irritation, the mucosa may form a polyp. A polyp is a round growth (like a small cyst) that can block nasal passages.
A sensation that your nose is blocked
Postnasal drip, which is when excess mucus runs down the back of your throat