Abdominal pain at night and no symptoms during the day may be caused by functional dyspepsia, chronic enteritis, duodenal ulcer and other diseases. 1. Functional dyspepsia: Because of the abnormal peristalsis of the smooth muscles of the gastrointestinal tract, the food ingested during the day is not fully digested at night, which can cause abdominal distension and abdominal pain at night. During the day, due to activities, the symptoms are not so obvious and do not feel uncomfortable. 2. Chronic enteritis: chronic inflammation of the intestinal tract can also occur, abdominal pain at night, because of the distraction of work and study during the day, may not feel the pain. 3. duodenal ulcer: duodenal ulcer, usually at night, abdominal pain, because of gastric acid stimulation of the ulcer surface foci caused by the stomach during the daytime when there is no fasting in the stomach ingested food, so there is no abdominal pain. Nighttime abdominal pain, daytime asymptomatic cause of a variety of possibilities, it is recommended to consult a doctor in a timely manner to identify the cause of early treatment.