Getting up in the morning with acid in the mouth has the following several diseases: 1, the most common is the digestive system diseases, such as chronic atrophic gastritis, erosive gastritis, reflux gastritis or gastroduodenal ulcer. The above cases will appear acid reflux, heartburn, nausea and other clinical symptoms, especially in the morning, the abdominal food is basically in the state of emptying, fasting gastric acid reflux is particularly obvious, then there will be a typical symptom of acid in the mouth. 2, diabetes can also appear acid in the mouth or accompanied by a dry mouth, thirst, this time is caused by the body’s blood glucose is too high, the blood glucose will be broken down into acetic acid, β-hydroxybutyric acid and acetone, will also be The clinical symptom of sour mouth after getting up in the morning can also occur.