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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.
In the case of a viral infection such as cold or flu, the first stage and also the last stage of the infection cause the production of a clear, thin mucus in the nose or back of the throat. As the body begins to react to the virus (generally one to three days), mucus thickens and may turn yellow or green.