Nasal polyps are soft, painless growths that develop on the lining of the nasal passages or sinuses. They are often associated with conditions like asthma, allergies, and chronic sinusitis. These growths can vary in size and may block airflow, leading to symptoms such as nasal congestion, reduced sense of smell, and sinus infections. The exact cause of nasal polyps is not fully understood, but they are thought to result from inflammation in the nasal lining. Treatment options include nasal corticosteroids to reduce inflammation, and in some cases, surgery may be necessary to remove larger polyps or those that do not respond to medication.