The presence of a bitter mouth and a bad taste in the mouth may be related to stomach or liver and gallbladder problems or H. pylori infection. If you have pain in the right upper abdomen, pain under the right shoulder blade, nausea and vomiting when eating greasy food, you may have cholecystitis and can take anti-inflammatory and cholagogic tablets and chicken bone herb pills. If you have symptoms of stomach acidity, bloating, food reflux and stomach pain, you may have bile reflux gastritis and can take omeprazole, Mosapride, Gastric Soda Granules. Bad taste in the mouth and bad breath can be checked by carbon breath test. If you have H. pylori infection, you should take amoxicillin, omeprazole, clarithromycin, bismuth potassium citrate, etc. Keep a stable mood, eat more food with stomach nourishing effect, eat regularly and strengthen physical exercise.