The reason for the bitter taste in the mouth after waking up is commonly due to bile reflux. Under normal circumstances, after waking up, the gallbladder will concentrate the bile accumulated the night before and discharge it into the duodenum, and the function of the stomach and intestines will basically be restored, so that it can participate in the digestion of the small intestine. However, under the influence of certain pathological factors, the function of the gastrointestinal tract is disturbed, and the bile does not flow downward, but instead flows backwards into the stomach, through the esophagus to the mouth, and then the bitter taste of the mouth will occur. After the occurrence of the above situation, firstly, you can eat vegetables and fruits to promote the peristalsis of the intestines and enhance the function of the gastrointestinal tract, so as to facilitate the digestion and absorption of food. Secondly, you can apply some drugs to promote the function of the gastrointestinal tract, such as the common morpholine or mosapride, to promote the peristalsis of the gastrointestinal tract and avoid the reverse flow of bile. Finally, the symptoms need to be relieved through exercise as well as regulating the mind. Because of long-term non-exercise or psychological stress, such symptoms can occur. And through a series of regulation, the symptoms of bitter mouth can disappear.