Sour mouth is associated with weakness of the spleen and stomach, bile reflux, stomach fire, cholecystitis and other diseases. People with a weak spleen and stomach will have their gastrointestinal system’s ability to digest food affected, and will often suffer from indigestion, stomach acidity, and bloating. Since a weak spleen and stomach cannot properly transport the body’s water and grain essence, it is also accompanied by increased salivation and sourness in the mouth. Some people’s stomach function is relatively poor gastric power is insufficient, due to the stomach food can not be emptied in time, and even lead to bile reflux. When bile reflux occurs, the human body’s stomach will be damaged, and will also stimulate excessive secretion of gastric acid induced mouth acidity. People who have a high stomach fire will not only have a high appetite, but will also secrete too much stomach acid, which makes their mouths acidic. Cholecystitis after the disease patients will not only appear abdominal pain, but also accompanied by indigestion and other manifestations, many people will therefore increase saliva secretion, mouth acidity.