Hello There, Probable causes of excessive salivation may be:- 1) Acidity-Gas and Gastritis 2) Aggravated Pitta Dosha and Kaph Dosha 3) Constipation 4) Chronic Infection of upper and lower respiratory tract 5) Allergy and poor Immunity 6) Indigestion 7) Gall bladder and Kidney stone 8) Swelling and Infection in Abdomen 9) Chest Infection 10) Irritation of diaphragm 11) Unhealthy food habits 12) Unhealthy Lifestyle *Correct diagnosis and accordingly proper Comprehensive treatment is needed.