Dry mouth and bitterness are mainly considered for the following reasons: First, the presence of oral cavity-related abnormalities: especially for patients with oral cavity-related infectious diseases, and daily inattention to diet, overeating, staying up late, smoking, drinking alcohol, and easy snoring while sleeping, can easily cause dry mouth and bitter performance. Second, the presence of digestive dysfunction: patients with digestive dysfunction have slowed gastrointestinal digestive motility, including the combination of factors such as Helicobacter pylori infection, gastritis, gastric ulcer may also lead to the appearance of dry mouth, bitter performance. Third, the presence of liver and gallbladder diseases: serious cirrhosis, hepatitis, cholecystitis, gallstones, etc. may lead to a dry, bitter mouth, which may lead to the possibility of bile reflux. For the above aspects, patients can further go to check whether there are relevant abnormalities.