Bitterness in the mouth is a relatively common self-conscious symptom in women during pregnancy, which may occur in the early stage of pregnancy, or in the middle or late stage of pregnancy. The main reasons for this symptom include: 1. early pregnancy is mainly related to the elevated level of progesterone and chorionic gland-promoting hormone in the body during pregnancy, which affects the emptying function of the gastrointestinal tract. 2. some women like to eat sweets during pregnancy, and the intake of too many sweets can also lead to bitter mouth symptoms, especially when waking up in the early morning. 3. diseases such as cholecystitis and gallbladder stones. Some pregnant women suffer from chronic cholecystitis, gallstones and other biliary system diseases, and after pregnancy, they do not pay attention to control the diet and eat too much fatty food, which will lead to the obstruction of bile secretion and excretion, and hence the symptoms of bitter mouth.