Lying down at night with a vague pain in the stomach, may be eating spicy and other physiological reasons caused by gastric secretion of gastric juice to stimulate the gastric mucosa, but also may be acid reflux, duodenal ulcer and other pathological reasons. 1. Physiological reasons: it may be that eating hot pot and other spicy food at dinner stimulates the gastric mucosa, and the reflux of digestive juices after lying down in the evening leads to a more pronounced feeling of hidden pain in the stomach. Eating sugar cakes, glutinous rice dumplings and other indigestible food, digestive fluid secretion increases, the digestive juices gather after lying down at night causing stomach pain. 2. Pathological causes: stomach acid reflux at night lying down, stimulate the esophagus to cause heartburn and other symptoms, there may be hidden pain in the stomach. Duodenal ulcer usually occurs when fasting abdominal pain, night food digestion, lying down may appear stomach hidden pain symptoms. If you exclude eating and other physiological reasons for the frequent occurrence of the phenomenon, you should consult a doctor in a timely manner, under the guidance of the doctor for treatment, so as not to delay the best treatment period. Usually pay attention to eat more easily digestible food, avoid cold and spicy food.