The causes of bitterness in the mouth of women in early pregnancy are as follows: 1, it may be that women in early pregnancy, loss of appetite or do not pay attention to oral cleaning, hygiene, etc., will lead to bitterness in the mouth. 2, related to the pregnancy reaction after pregnancy, in pregnancy due to women’s nausea, vomiting, and even can not eat, may also lead to increased bile secretion, so bile spit into the mouth of women, will also 3, women in early pregnancy, mental stress, mood swings, mood unstable, etc., will also lead to bitter mouth. 4, if women eat food too greasy or too sweet and sour, will also cause bitter mouth. Therefore, if a woman has a bitter mouth during pregnancy, she should pay attention to eating more fresh vegetables and fruits to ensure a light diet and drink more water to help relieve the bitter mouth.