Acid vomiting in the middle of the night has the following causes, acid vomiting in the middle of the night is called acid reflux, that is, the gastric juice has been refluxed, because of the following factors: 1, too much food eaten before going to bed, overeating without exercise digestion and metabolism after lying down to sleep, at this time will lead to excessive secretion of gastric acid, excessive secretion of internal acid will appear obvious acid vomiting in the middle of the night. 2, if the patient has a gastric ulcer or duodenal If the patient has gastric ulcer or duodenal ulcer, acid reflux, heartburn and nausea will occur in the middle of the night, especially in the early morning hours. 3, if the pressure of the esophageal sphincter is reduced, this will also increase acid reflux, which is related to drinking tea and coffee at night. Therefore, for patients who vomit acid in the middle of the night, it is recommended to go to the hospital to systematically identify and identify the cause of the disease and treat it with medication.