Stomach bloating at night is usually caused by excessive food intake, pyloric obstruction, duodenal ulcer and other factors. Many people are busy with work during the day, so they will overeat at night. When the stomach is overfilled with food, it will lead to overexpansion of the body of the stomach, and even affect the function of gastric peristalsis, thus resulting in a feeling of bloating and pain in the stomach. The pylorus is often exposed to Helicobacter pylori bacteria, so it will be more likely to develop gastric ulcers, and after repeated episodes will also induce pyloric obstruction. In patients with pyloric obstruction, the food ingested during the day cannot be excreted in time and ferments in the stomach, so the stomach becomes distended at night, and some people may vomit the food they ingested during the day. Most of the bloating pain in the stomach at night if it occurs during the middle of the night is due to duodenal ulcers. The main reason is that the concentration of stomach acid discharged into the duodenum is too high, causing irritation to the duodenal mucosa and causing it.