Sour mouth is likely to be caused by oral problems, it is recommended to brush your teeth every morning and evening, and pay attention to rinse your mouth after eating and drinking during the day, so that you can effectively prevent bacteria from multiplying in the oral cavity leading to sour mouth. Of course, it may also be due to the reflux of gastric juice and bile reflux, this situation is likely to be caused by gastritis, if the patient himself has some stomach inflammation, you can choose to take norfloxacin or morphine to help treatment. If the symptoms are very serious, you can also choose to eat intestinal inflammation to help regulate intestinal inflammation, azithromycin can also be more effective to help patients alleviate gastrointestinal inflammation, only gastrointestinal inflammation is resolved in order to make the mouth acid to get a thorough treatment. If it is due to the diet caused mouth acidity can also eat some alkaline food to help neutralize the balance.