Anosmia, or a lack of sense of smell or taste, can sometimes ... at night when you lie down. Bad breath, or halitosis, may also occur due to post-nasal drip. Mucus can build up and cause the ...

Larger polyps can lead to breathing problems, a loss of taste or smell, and infections. Symptoms include a post-nasal drip, stuffiness, sinus pressure, facial pain, and frequent nosebleeds.