The more common cause of bitter mouth in the elderly is bile reflux due to peristaltic dysfunction of the gastrointestinal tract that occurs with advancing age. After bile is secreted by the liver, it is stored in the gallbladder at night. When the organism begins to move as well as ingest breakfast in the morning when it is awake, the concentrated bile in the gallbladder is discharged to the duodenum through gallbladder contractions and participates in food digestion. With age, the function of the organs of the elderly declines, bile can not effectively pass through the duodenum into the small intestine, but backflow to the stomach, and even through the esophagus reflux into the mouth, so the patient will feel a bitter taste in the mouth. At this time, it is recommended to have a light diet so as to reduce the burden on the gastrointestinal tract, and also to avoid the reverse bile reflux through the use of drugs that promote the function of the gastrointestinal tract such as morpholine. Through comprehensive treatment, the symptoms of bitter mouth can usually be effectively improved.