The causes of nausea and acid reflux in the morning include gastroesophageal reflux disease (GERD), gastric emptying disorder, and early pregnancy reaction. 1. Gastroesophageal reflux disease (GERD): long-term alcohol consumption, long-term consumption of chocolate, obesity, etc. may lead to lower esophageal sphincter dysfunction or esophageal mucosal barrier function is reduced, so that the gastric contents of the stomach reflux into the oral cavity, resulting in spitting acidic water, i.e. acid reflux. 2. Gastric emptying disorder: gastric insufficiency, pyloric obstruction, etc. can cause gastric emptying disorder, coupled with increased secretion of gastric acid at night, gastric acid and gastric contents accumulate in the stomach, which leads to nausea in the morning, acid reflux and other symptoms. 3. Early pregnancy reaction: Pregnant women in the early stages of pregnancy, the body HCG level increases, gastric acid secretion decreases, while the gastric emptying time is prolonged, can also cause nausea, vomiting, acid reflux and other symptoms. The causes of nausea and acid reflux in the morning are not limited to those mentioned above. If the above symptoms are not relieved, or accompanied by other symptoms, you should go to the hospital in time to see a doctor and get a clear explanation of the cause of the problem and then give targeted treatment.