Sour mouth may be caused by oral diseases, or it may be related to gastrointestinal diseases or cholecystitis, and it is not necessarily a precursor to serious illness.
1. When oral diseases such as gingivitis, periodontitis or mouth ulcers occur, bacteria grow in the mouth and food residues ferment and produce acid under the action of the bacteria, resulting in sour mouth.
2. Incomplete digestion of food by the gastrointestinal digestive system can lead to indigestion, stomach acidity, increased salivation and symptoms of sour mouth. Acid in the mouth can also occur when the stomach is damaged during bile reflux from cholecystitis, which stimulates excessive secretion of stomach acid.
So sour mouth may be an oral disease or a digestive disease, you can go to a dentist or a gastroenterologist.