You may not know that you have a nasal polyp if it is small enough, but there are several symptoms that can start to develop as the polyp grows or if it is already larger. They can be indicated by irritation or inflammation in your nasal passages and sinuses that persists for longer than 12 weeks. Common symptoms that are indicative of a polyp include a runny nose, postnasal drip, lack of sense of smell, frequent nosebleeds, stuffiness, pressure, pain, or aching in the upper teeth, face, or forehead, and persistent snoring. It is possible to have multiple polyps or just one larger polyp before you will notice that they are blocking your nasal passages and sinuses, potentially causing you to suffer from asthma, sleep apnea, sinus infections, and troubles with breathing. To diagnose or identify a polyp, a physician may need to use an endoscope to look into your nasal passages or perform a CT scan.