Nasal polyps are small, painless, non-cancerous growths occurring in the inflamed tissue of the nasal passages. They may occur in people with no history of nasal problems but are often triggered by chronic inflammation caused by other conditions, such as chronic or recurring sinus infections, asthma, cystic fibrosis, or allergic rhinitis.

Symptoms of nasal polyps include a runny nose, a decreased sense of smell, loss of taste, pain in the upper teeth, facial pain, headaches, snoring, and pressure felt in the forehead or face. Severe cases of nasal polyps may result in other complications, such as obstructive sleep apnea, flare-ups of asthma, and increased susceptibility to sinus infections. 

Measures to prevent nasal polyps include effective management of allergies and asthma, avoidance of irritants such as tobacco smoke, good hygiene, nasal rinsing, and maintaining higher levels of humidity in the home. 

Treatment of nasal polyps may involve surgery to remove the polyps, but medication is usually the first step. Drug classes used to treat nasal polyps are systemic corticosteroids, plain and topical nasal corticosteroids.