Nasal polyps develop along the lining of the nasal cavity. The characteristics of these polyps are that they vary in size and are non-cancerous. For the most part, they don't cause any major problems or side effects. However, they do pose a serious problem when they grow excessively large. There are telltale signs that you have swollen nasal polyps. These include the following: Enlarged nose
Widened eyes
Extreme sinus headaches and pain