There are also some cancer patients who feel bitter in the mouth even after eating sweet food because the starting threshold of sweet taste is elevated and the starting threshold of bitter taste is lowered. In addition, there are also some people who have esophageal reflux and often have bile reflux into the esophagus at night, so they may feel bitter in the morning. Therefore, if everything you eat is bitter, it is recommended to go to the gastroenterology department of a regular hospital for examination as soon as possible to see if there is acute inflammation of the hepatobiliary system, and if so, to treat it accordingly as soon as possible. If there is no organic disease in the liver and biliary system, you can also go to the TCM department of a regular hospital or a large Chinese medicine hospital for examination. The Chinese medicine practitioner can look, smell, ask questions and cut, and then treat the patient with evidence.