Drooling is acidic, which generally means saliva with a sour taste, is common in colds, indigestion, peptic ulcer and bile reflux gastritis. 1. Cold and flu: during cold and flu, stomach acid and saliva secretion is more, after eating food containing starch, acid will be formed, and it feels like drooling is acidic. 2. Indigestion: If the digestive function of the stomach and intestines is disturbed, it will easily lead to acid reflux, which is often referred to as acid reflux symptoms, and the drooling is acidic. 3. Peptic ulcer: if you have a peptic ulcer, patients with saliva lactic acid, phosphatase and carbonic anhydrase content is significantly higher than normal, drooling is acid. 4. bile reflux gastritis: due to gastric mucous membrane damage resulting in increased gastric acid, there will be gastric acid reflux, drooling is also acidic. If the drooling is acidic, it is recommended to go to the regular hospital for consultation and examination, to clarify the causes of acidic drooling, and to exclude the influence of disease factors in a timely manner.