Pregnant women get up in the morning with a bitter mouth, mainly related to early pregnancy reaction, excessive stress, poor sleep, oral inflammation, stomach inflammation, liver and gallbladder disease. Physiological factors: 1, early pregnancy reaction: during pregnancy due to changes in hormone levels in the body, nausea, vomiting, loss of appetite, indigestion and other early pregnancy reactions, which in turn leads to pregnant women get up in the morning bitter mouth; 2, excessive pressure: pregnant women due to the reaction to excessive pressure during pregnancy, there can be anxiety, fear and other negative emotions, which leads to irregular life, lack of exercise, etc., which can lead to mental bitter mouth; 3, poor sleep : Pregnant women who do not get enough quality sleep, snore or sleep with their mouths open are prone to affect salivary secretion, causing bitter mouth in the morning. Second, pathological factors: 1, oral inflammation: if the pregnant woman suffers from gingivitis, periodontitis, bleeding gums, dental calculus and other oral diseases, it is easier to cause morning mouth bitter; 2, gastric inflammation: pregnant women in the sleep at the peak of gastric acid secretion, and itself suffers from esophagitis, chronic gastritis, pregnant women, because of inflammation stimulation leads to excessive secretion of gastric acid, which produces dampness and heat caused by the morning mouth; 3, liver and gallbladder diseases: due to the liver and gallbladder Inflammation, such as cholecystitis, cholelithiasis and other bile reflux and excretion of abnormalities, may cause pregnant women to get up in the morning bitter mouth.