This document defines and describes nasal polyps and two main types - ethmoid and antrochoanal polyps. Ethmoid polyps arise from the ethmoid sinuses and appear as grape-like structures visible on anterior rhinoscopy. Antrochoanal polyps originate in the maxillary sinus and may extend through the nasal cavity and choana. Both cause nasal obstruction and other symptoms. Diagnosis involves nasal endoscopy, imaging, and biopsy. Treatment options include medical management, functional endoscopic sinus surgery, steroids, and polypectomy.