The main causes of bitterness in the mouth in early pregnancy are pregnancy reaction, improper diet, gallbladder disease, etc. It is recommended to pay attention to diet, maintain oral hygiene, proper exercise, and if there are gallbladder stones and other digestive tract diseases, timely medical treatment is required. 1. Pregnancy reaction: In early pregnancy, due to changes in hormone levels in the body, symptoms such as nausea and vomiting will occur, accompanied by bitterness in the mouth. Daily attention to eat a light diet high in vitamins, easy to digest, such as fresh fruits and vegetables, eat less and more meals, avoid eating spicy, greasy, irritating food, drink more water or honey water, can also avoid bitterness in the mouth at the beginning of pregnancy; 2, improper diet: some women like to eat stinky tofu, bitter melon, durian, snail powder and other heavy-tasting food, easy to cause bitterness in the mouth at the beginning of pregnancy, generally stop eating Such food can improve the symptoms; 3, gallbladder disease: such as gallbladder stones, patients with biliary colic, accompanied by nausea, vomiting, severe vomiting will have bile reflux and cause bitterness in the mouth. It is recommended to seek medical attention in time to control the symptoms and, if necessary, to terminate the pregnancy.