Mucous secreting glands are present in our nasal cavity,throat,food pipe,wind pipe.Some amount of mucous production is normally needed which acts as a cleaning pathway of microorganisms,swallowing function and respiration.In some pathological conditions like chronic sinus infections post nasal drip can lead to excessive production of mucous.Like allergic rhinitis,allergic bronchitis are some other causes of excessive mucous productions.Bacterial and viral infections of respiratory tract also causes excessive phlegm production.General management includes avoidance of smoking,(if any).try to keep away fro irritant pollutant smokes,examination of nose,throat by Ent specialist to rule out any pathology.