I Have Extreme Mucus Buildup Constantly In My Upper Throat. Nothing Seems To Help - Steroid Nasal Sprays, Decongestants, Mucinex. What Could Be Causing This?

1. If you are a regular smoker, than this is due to smoking. 2. You might be having dust allergy or pollution allergy due to heavy traffic. 3. Your bone of your nose can be enlarge enough to cause this problem.