Causing stomach pain at night may be related to the following reasons: 1. Gastrointestinal dysfunction caused by improper diet, indigestion leads to symptoms of stomach pain at night. For example, eating a lot of cold, spicy, irritating food, such as chili peppers, onions, cold drinks, cold beer, etc., over-eating dinner, abdominal cold, etc.. It is important to take a light and easy to digest diet, avoid overeating and not to eat too much for dinner. 2, related to digestive system diseases, such as gastritis, gastric ulcer, duodenal bulb ulcer, stomach cancer and other diseases, can cause to the symptoms of stomach pain at night. At this time, you should go to the hospital to do relevant auxiliary examinations, such as gastroscopy to clarify the diagnosis. 3, certain mental factors, such as long-term tension, anxiety, depression, etc., can lead to plant nerve dysfunction, causing the symptoms of stomach pain at night, to keep a happy mood to avoid overwork.