Excessive phlegm causes would mean that the throat is inflamed. This inflammation could be due to an allergy, smoking or an infection. To treat this excessive phlegm, it is important to get to the underlying reason for it. Treatment can be started accordingly.
Post nasal drip
could be what causes phelgm. Post nasal drip can be caused by dairy products, inhaled irritants, smoking, throat and swallowing disorders, colds and flu, living in dry areas, as well as eating foods that you are allergic too.
Phlegm in lungs can be caused asthma, bronchitis
, or even Chronic Obstructive Pulmonary Disease
and irritation are some of the conditions that cause phlegm in the lungs.