Excess mucus can be caused by a wide range of factors such as respiratory infections and illnesses. Diseases that cause excessive mucus production include chronic obstructive pulmonary disease (COPD), ...

Postnasal drip occurs when secretions in the back of your nose drip down into your voice box, forcing you to cough, she explains. “Allergies, viruses, sinus infections, and non-allergic rhinitis are ...