Nasal polyps definitely develop in the nasal cavity or sinuses. Due to the complex anatomical structure of the nasal cavity and sinuses, and the variation in the causes and timing of the condition among individuals, the location of polyps is not fixed and each patient has unique characteristics. Some polyps originate in the maxillary sinus and grow at the opening of this sinus, extending to the back end. This commonly occurs as posterior nasal polyps of the maxillary sinus, often seen in teenagers or children, and are more common in males than females. Generally, polyps can grow in the middle nasal meatus or olfactory fissure, and in some severe and long-standing cases, polyps can grow throughout the nasal cavity and sinuses.