There are several causes of acidity in the mouth: 1. Damp heat in the liver and gallbladder: Damp heat in the liver and gallbladder can lead to acidity in the mouth because damp heat in the liver and gallbladder can erode the spleen. In addition, there are symptoms such as bloating after meals, nausea, vomiting, yellowing of the tongue, and in severe cases, chest tightness and rib pain. 2, acid reflux: gastrointestinal diseases can also lead to acid in the stomach, such as gastritis, gastric ulcer, enteritis, duodenal ulcer, etc. These diseases can lead to acid reflux into the mouth, leading to acid in the mouth in addition to nausea, vomiting symptoms. 3, food factors: eating particularly acidic food, such as sour plums, lemons, apricots, etc., can lead to sour mouth, The first thing you need to do is to take a look at the website.