What You Need To Know About Ptyalism This condition along with the condition of morning sickness and nausea is present till the 12 weeks of pregnancy is completed. These three conditions are common signs of early pregnancy. The causes of excessive saliva during pregnancy includes: Excessive saliva is found due to the hormonal changes in the body but it is not liable to all the women. Some women can face this condition even during their periods due to the fluctuations in their hormones during the pregnancy period. Excessive saliva formation can be a result a heart burn. Actually, the acidic contents of the stomach back up and irritate the contents of the esophagus which causes burning sensation. In y...