A bitter taste after eating is usually caused by poor digestion in the gastrointestinal tract, resulting in the manifestation of bile reflux. Under normal conditions, food reaching the stomach will prompt the gallbladder to contract and empty the bile and discharge into the duodenum to begin digestion and absorption, especially of fatty foods. If the patient has problems with the function of the gastrointestinal tract, bile can reflux to the stomach and then to the esophagus and the mouth, resulting in the symptoms of bitter mouth. It is recommended that such patients improve the related symptoms through dietary structure modifications and medication modifications. The dietary structure should be based on vegetables and fruits, including green vegetables, cabbage, bananas, apples and pears, which can reduce the digestive burden of the gastrointestinal tract for easier digestion and absorption. In addition, patients can take drugs to increase gastrointestinal tract motility, such as morpholine, which can promote gastrointestinal tract peristalsis and avoid bile reflux.