Dry mouth and bitter mouth may be elevated blood sugar, gastroesophageal reflux disease and other diseases caused by the need for targeted treatment under the guidance of a doctor, such as gastroesophageal reflux disease can be prescribed to take omeprazole, domperidone and so on. 1. Elevated blood sugar: elevated blood sugar can cause dry mouth and other abnormalities, should be actively lowering sugar treatment, under the guidance of the doctor to take acarbose, metformin and other hypoglycemic drugs or injections of insulin to reduce blood sugar. 2. Digestive system diseases: gastroesophageal reflux disease (GERD) can cause bitter taste in the mouth, which should be treated with drugs to inhibit gastric acid secretion such as Ranitidine and Omeprazole, and gastric stimulants such as Domperidone and Mosapride. Patients with high blood sugar who have symptoms of bitter mouth and dry mouth should go to the hospital and ask the doctor to make a judgment and give appropriate treatment measures.