Why do I have excessive saliva during my pregnancy?

Some women experience excessive saliva in their mouths during pregnancy, which may or may not be accompanied by nausea. Doctors, dentists, and researchers do not fully understand the reasons for this. It might be related to more circulating blood volume in the pregnant woman's body, or some other hormonal changes during pregnancy might trigger the release of excess saliva from the parotid gland. Some women experience excessive saliva early in the first trimester, and it may not stop until roughly the end the first trimester.