Dry mouth and bitter mouth may be related to diet, gallbladder disease, diabetes and so on. 1. Diet: If the daily diet is too salty, heavy oil, and usually drink less water, it may lead to the phenomenon of dry mouth and bitter mouth. 2. Gallbladder disease: for example, chronic cholecystitis, due to bile metabolism disorder, may also appear bitter mouth performance. 3. Diabetes mellitus: due to the metabolic abnormalities in the body, diabetic patients may also have dry mouth symptoms, and often feel thirsty, and therefore may have symptoms such as excessive drinking and urination. If the symptoms of dry mouth or bitter mouth occur frequently, it is recommended that the patient consult a doctor for examination in a timely manner, usually drink more water, and try to eat a light diet.