Stomach acid reflux in the morning is related to diet, gastritis, esophageal sphincter relaxation and other factors. The performance of stomach discomfort, acid reflux and heartburn after waking up in the morning is considered to be caused by diet, such as eating high-fat, high-calorie and indigestible food such as chocolate the night before, which is difficult to digest and will also cause stimulation to the stomach, causing increased secretion of gastric acid, and the performance of acid reflux in the stomach will appear after waking up in the morning. Drinking alcohol or eating irregularly the night before and eating spicy and irritating foods can cause damage to the gastric mucosa, thus causing increased stomach acid. Patients with chronic diseases of the stomach such as gastritis and gastric ulcer will have gastric acid secretion when the stomach is empty, causing gas, burning sensation and also causing acid reflux and other manifestations. Patients with stomach diseases consume more food to squeeze the stomach wall, resulting in slow stomach peristalsis, which can produce more stomach acid, and cause acid or food reflux due to relaxation of the lower esophageal sphincter, resulting in acid reflux.