Feeling bitter in the mouth when eating is mostly a sign of acute inflammation, with liver and biliary diseases being the most common. There are some cancer patients who feel bitter mouth or bitter tongue even after eating sweet food because of the elevated threshold of sweet taste starting point and lower threshold of bitter taste starting point. Chinese medicine clinically considers mouth bitterness as heat evidence of liver and gallbladder and heat evidence of stomach and intestines, so if mouth bitterness occurs frequently, specific treatment is as follows: 1. It is recommended to go to the gastroenterology department of regular hospital for examination as early as possible to see if there is liver and gallbladder disease. If there is acute inflammation of the liver and gallbladder system, corresponding treatment should be carried out as early as possible according to different diseases.2. Cancer embryonic antigen examination of blood can be done to see if there is malignant tumor in the body, and treatment of malignant tumor can be carried out as early as possible.3. If there is no inflammation of the liver and gallbladder system and malignant tumor, examination can be carried out in the Chinese medicine department of a regular hospital, and Chinese medicine practitioners will treat the symptoms by looking, smelling, asking and cutting, and can Through Chinese medicine to dredge the liver and bile, adjust the heat evidence of stomach and intestines, liver and bile, and remove the mouth bitterness.