The patient’s mouth is always bitter, to determine whether there are problems in diet, living habits, oral cavity, gastrointestinal, liver and gallbladder, all of which may cause the symptoms of bitter mouth, mainly consider the following aspects: 1, bad lifestyle: recent irregular diet, overeating, as well as smoking, excessive drinking, or staying up late, stress, etc., these factors may lead to bitter mouth, to adjust from these aspects 2. abnormal inflammation in the mouth: such as mouth ulcers, gingivitis, dental calculus, mumps, tonsillitis, etc., can also lead to abnormal inflammatory infections in the mouth and symptoms of bitter mouth. 3. gastrointestinal diseases: indigestion, Helicobacter pylori infection, slowed peristalsis, may also lead to bitter mouth. 4. diseases of the liver and gallbladder: such as bile reflux, cholecystitis, gallbladder stones, can also lead to symptoms of bitter mouth.