what causes build up of mucus in throat
List of 34 causes of Mucus buildup. This section shows a full list of all the diseases and conditions listed as a possible cause of Mucus buildup in our database from various sources. 1  Adenovirus. 2  Allergic rhinitis. 3  Allergies. 4  Antrochoanal polyp. 5  Asthma. 6  Atrophic rhinitis. 7  Bronchitis.