The causes of a bitter mouth may include oral problems, digestive problems and so on. 1. Bitter mouth first consider oral problems, such as dental caries, gingivitis, this case will lead to bacterial growth in the mouth, oral odor, mouth bitter symptoms. It is best to go to the hospital stomatology department to see if there is a problem, according to the specific circumstances of timely treatment. 2. Bitter mouth also consider digestive problems, such as gastrointestinal tract dysfunction, not able to digest food well, there will be bitter mouth phenomenon. In addition to consider the liver and gallbladder disease, hepatitis, cholecystitis, this time not only bitter mouth, there will be loss of appetite, the phenomenon of the right upper abdominal pain, you can go to the hospital for liver function tests, liver and gallbladder ultrasound, Helicobacter pylori test, and then comply with the doctor’s instructions to use the drug. Bitter mouth, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to take targeted treatment.