There are many reasons for pregnant women to have a bitter mouth in early pregnancy, and the more common reasons include the following: 1, when pregnant women have cholecystitis and gallstones, bile will reflux into the upper gastrointestinal tract, and some pregnant women have reflux esophagitis, bile will reflux into the oral cavity, resulting in the phenomenon of bitter mouth. 2, in the early stages of pregnancy, due to a significant increase in body The patient’s mouth may become bitter due to the hormone secretion in her body, which may cause stimulation to the gallbladder, stomach and esophagus. 3. Some pregnant women may also experience bitterness due to occupational lesions in the biliary tract, upper gastrointestinal tract and pancreas, which may cause the retrograde flow of bile into the mouth.