1. Causes of Bitter Mouth in Pregnant Women Bitter mouth in pregnant women refers to uncomfortable symptoms such as dry mouth and tongue discomfort during pregnancy. The reasons may be related to changes in hormonal levels during pregnancy, gastrointestinal dysfunction, unbalanced nutritional intake and other factors. 2. Harm of bitter mouth in pregnant women Although bitter mouth in pregnant women seems to be a slight discomfort, if it is not relieved for a long time, it will have a certain impact on the health of the mother and fetus. For example, it can cause loss of appetite in pregnant women and affect nutrient absorption.